Question

Tính hợp lí:

a) (-37) – 14 – 26 + 37=

d) 34 + 35 + 36 + 37 – 14 – 15 – 16 – 17 =

g) – 87 + (-12) – (-487) + 512 =

Answer 1

hừm

Answer 2

c) (-37) – 14 – 26 + 37=(-37)+37-14-26=0-(-12)=12
d) 34 + 35 + 36 + 37 – 14 – 15 – 16 – 17 =(34-14)+(35-15)+(36-16)+(37-17)=20+20+20+20=80
g,-87+(-12)-(-487)+512=(-87+512)+[(-12)-(-487)]=425+475=900