Question

x-y=8

y-z=10

x+z=12 

vay x+y+z = ?

ai tra loi nhanh se duoc kb va k

Answer 1

Ta có: (x-y)+(y-z)+(x+z)=x-y+y-z+x+z=8+10+12 hay 2x=30 => x=15.

=> y=x-8=15-8=7

     z=12-x=12-15=-3

Vậy x+y+z=15+7+(-3)=19

Answer 2

Ta có: x-y+y-z+x+z=8+10+12 hay 2x=30 => x=15.

=> y=x-8=15-8=7.

     z=12-x=12-15=-3.

Vậy x+y+z=15+7+(-3)=19.