giả sử chiều dài và chiều rộng ban đầu là 100 cm.

chiều dài sau khi tăng là:

100 + 20 = 120 (cm)

chiều rộng sau khi giảm là:

100 - 20 = 80 (cm)

diện tích đầu là:

100 x 100 = 10000 (cm2)

diện tích sau là:

120 x 80 = 9600 (cm2)

tỉ số phần trăm hình chữ nhật trước và sau là:

9600 : 10000 = 0,96 = 96%

diện tích hình chữ nhật giảm là:

100% - 96% = 4%

đáp số: 4%.

Chiều dài mới bằng:

               100% + 20% = 120% (chiều dài cũ)

Chiều rộng mới bằng:

               100% - 20% = 80% (chiều rộng cũ)

Diện tích mới bằng:

               120% x 80% = 96% (diện tích cũ)

Diện tích hình chữ nhật đó giảm đi:

               100% - 96% = 4% 

                         Đáp số: Giảm đi 4%

Giả sử chiều rộng là 1 và chiều dài là 2 , ta có :

Chiều rộng sau khi tăng là :

1 - (1 x 20%) = 0,8

Chiều dài sau khi tăng là :

2 + (2 x 20%) = 2,4

Diện tích ban đầu là : 

2 x 1 = 2 

Diện tích lúc sau là :

2,4 x 0,8 = 1,92

Tỉ số phần trăm giữa diện tích ban đầu và diện tích lúc sau là :

1,92 : 2 x 100 = 96%

Vậy diện tích giảm đi là :

100% - 96% = 4%

ĐS : 4%

Like mình nha !

Giả sử chiều rộng là 1 và chiều dài là 2 , ta có :

Chiều rộng sau khi tăng là :

1 - (1 x 20%) = 0,8

Chiều dài sau khi tăng là :

2 + (2 x 20%) = 2,4

Diện tích ban đầu là : 

2 x 1 = 2 

Diện tích lúc sau là :

2,4 x 0,8 = 1,92

Tỉ số phần trăm giữa diện tích ban đầu và diện tích lúc sau là :

1,92 : 2 x 100 = 96%

Vậy diện tích giảm đi là :

100% - 96% = 4%

ĐS : 4%

Nhớ like mình nha ^^

4 sai roi minh vua lam xong

vay bao nhieu moi dung

4 LÀ SAI BÉT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

gọi chiều dài là a chiều rộng là b 

nếu tăng chiều dài thêm 20% thì chiều dài mới 

        100%+20%=120% chiều dài cũ hay là 120/100 a

nếu chiều rộng cũ dảm 20% thì chiều rộng mới

        100%-20%=80% hay la 80/100 b

diện tích mới = chiều dài mới * chiều dài cũ

diện tích mới là:

     =(120/100*b) +(80/100*a) =120+80/100+100 = 96=a*b

tức là diện tích mới bằng 96% diện tích cũ

 vậy diện tích mới kém diện tích cũ số phần trăm là :

100%-96%= 4%

Đáp số: 4%

nhớ k cho mik nha

Giảm 4% đấy bạn

bang 4% 

hơi bị chuẩn đấy

4% nha thank you

Giảm 4%.Kết bạn với mình nhé.

100-12x8+4%

Vuhuykhanh thế bn ra bao nhiêu

Excuse me, I don't understand  Vietnamese so you can swicth to english?

Chiều dài ban đầu là 100%

Chiều rộng ban đầu là 100%

Chiều dài sau khi tăng thêm 20% là 120%

Chiều rộng sau khi giảm đi 20% là 80%

Diện tích HCN ban đầu là : 100% x 100% = 100%

Diện tích HCN mới là : 120% x 80% = 96%

Vậy diện tích HCN sẽ giảm đi : 100% - 96% = 4%

Đ/s : 4%

Chúc bạn học tốt !!!

weffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrewrrrrrrrrrrrrrrrrrrrrrrrrrwrererererereefffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffweffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffwwwwwweeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrre...

fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff...

Ok Tomori Nao

Một HCN nếu tăng chiều rộng để bằng chiều dài thì diện tích tăng 20 cm vuông, khi giảm chiều dài để bằng chiều rộng thì diện tích giảm 16 cm vuông. TÍnh diện tích HCN ban đầu