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2m = 200 cm
Tổng của 2 cạnh ngắn và dài lúc đầu là :
\(200\div2=100\)( cm )
Tổng của 2 cạnh ngắn và dài lúc sau là :
\(100-20=80\)( cm )
Vì hình thoi là hình có 4 cạnh bằng nhau nên 80 cm bằng 2 lần cạnh ngắn
Vậy cạnh ngắn là :
\(80\div2=40\)( cm )
Cạnh dài lúc đầu là :
\(40+20=60\)( cm )
Diện tích miếng bìa lúc đầu là :
\(60\times40=2400\)( cm2 )
Đáp số : 2400 cm2
( Bạn có thể vẽ thu nhỏ hình rồi đo và thử kết quả theo đề bài )
diện tích miếng bà hình bình hành là
\(2400cm^3\)
k mik nnha CÁC BN
Vì 1600 = 40 x 40
Vậy cạnh hình vuông là 40 cm
Chiều dài của hình chữ nhật là: 40 + 20 = 60 (cm)
Nửa chu vi hình chữ nhật là: 2 : 2 = 1 (m)
1 m = 100 cm
Chiều rộng hình chữ nhật là:
100 - 60 = 40 (cm)
Diện tích hình chữ nhật là:
60 x 40 = 2400 (cm2)
2400 cm2 = 24 dm2
Chọn C. 24 dm2
1800 cm2 = 18 dm2
các bn đâu cần cãi nhau như vậy
1800
tao mac ke may
1800 là đúng,mình làm rồi
18dm2 mới đúng
phai la 18 chu minh khong thay co 1800 ma
18 la dung day tin minh di
1800 là sai 18m mới đúng
tớ nghĩ là 1800
18 là đúng mình làm rồi
18 mới đúng
18 dm2
18 dm đó nha !
18 dm2
18 dm2 dung do minh lam roi
Cách làm là gì vậy?
18 minh lam tren violimpic
18 dm2 nha
ai là 18dm2 là đúng còn 1800 là sai vì mình thi violympic rồi mà
18dm2 la dung , minh lam roi
rốt cục cái nào đúng ?! :))
giải thích đi
mấy bọn kia nói 1800 nghĩa là 1800cm2
cho cách làm đi
18dcm2
Mình làm olympic được 300 điểm nè
thôi ko cần cãi nhau nữa
kết quả là 18 dm2 đúng ko
rùi cảm ơn nha
18 dm2 đúng đó
18 day chuan luon
18 nha 19999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999%
18 đó mình làm rồi mà
Đáp án là 18m2.
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