Question

Tinh nhanh

3 + ( - 12 ) + 13 + ( -22 ) + ..........+ 93 + ( - 102 )

Answer 1

Ta có :

3 + ( - 12 ) + 13 + ( -22 ) + ..........+ 93 + ( - 102 )

= [ 3 + ( -12 ) ] + [ 13 + ( -22 ) ] + ... + [ 93 + ( -102 ) ]

= -9 + ( -9 ) + .... + ( -9 )

= ( -9 ) . 10

= -90

Answer 2

ai tra loi nhanh va dung minh se k cho