là 307 đúng ko nhỉ

B=(1+2-3-4)+(5+6-7-8)+...+(301+302-303-304)+(305+306)

B=-4+(-4)+(-4)+...+(-4)+611

B=-4x76+611

B=-304+611=307

Ai thấy mình làm đúng thì tích nha.Ai tích mình mình tích lại

307 dung 1000000000000000000% luon

307

100%

= 307 ha ha chả biết có đúng ko

1+2-3-4+5+..............-303-304+305+306

=1+(2-3-4+5)+............+(302-303-304+305)+306

=1+0+.........+0+306

=1+306

=307

307 la dung 

k di

=307 đó nha

307 mink lam trong violympic rui 100%

1) Ai muốn choi "Minecraft" bằng mạng lan Hamachi thì vô hội của tao đi ! :((

                              Network ID : 11212266

                              Passwork : 1230        

2) Một con ốc sên roi xuống một hố sâu,ban ngày leo lên được 9/10m, ban đêm leo được 2/5. Hỏi sau một ngày đêm ốc sên leo lên được bao nhiêu mét, bao nhiêu xăng-ti-mét?

Bằng 307 chắc chắn 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%

là 307 nha

nêu huong lam gôm cac sô co gia tri dua ra la bang 4 cong tong ra dap so

307,chuẩn lun đó

307 dung 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%

307 đó bạn

307 la đúng 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%

307 k cho mình nha

ĐÚNG 100% LUÔN

307 dung 

mình thi rùi mà

k cho minh nhé

307 đúng 100% mình mới gặp rồi

dung 10000000000000000%luon

Ta có: 
1 + 2 - 3 = 0
1 + 2 - 3 - 4 = - 4
1 + 2 - 3 - 4 + 5 = 1
1 + 2 - 3 - 4 + 5 + 6 = 1 + 6 = 7
Suy ra: 1 + 2 - 3 - 4 + 5 + 6 - … - 303 - 304 + 305 + 306 = 1 + 306 = 307
Vậy: B = 307

B = 1 + 2 - 3 - 4 + 5 + 6 - ....... - 303 - 304 + 305 + 306

   = 1 + 2 + ( -3 + 5 ) + ( -4 + 6 ) - ....... + ( -303 + 305 ) + ( -304 + 306 )

   = 1 + 2 + ( 2 ) + ( 2 ) + ......+ ( 2 ) + ( 2 )

Có tất cả 152 cặp có giá trị bằng 2. Vậy B = 1 + 2 + 152.2 = 307.

Tích cho mk nha

Ta có: 
1 + 2 - 3 = 0
1 + 2 - 3 - 4 = - 4
1 + 2 - 3 - 4 + 5 = 1
1 + 2 - 3 - 4 + 5 + 6 = 1 + 6 = 7
Suy ra: 1 + 2 - 3 - 4 + 5 + 6 - … - 303 - 304 + 305 + 306 = 1 + 306 = 307
Vậy: B = 307

307 đó mọi nhười:))

Tích mik nha!!

307 đó !!!!!!!!!!!