Question

[Ren Hakuryuu]

B = 74 - 73 + 72 - 71 +.................+2 - 1

Answer 1

[Thanh Tùng DZ]

B = 74 - 73 + 72 - 71 +.................+2 - 1

B = 1 + 1 + ... + 1

mà có 37 số 1

B = 1 x 37

=> B = 37

Answer 2

[Ren Hakuryuu]

thank you very much