Question

\(\frac{x}{y}=2vàx+2y+8=0\).Khi đó x-y=.....

Answer 1

x/y=2=>x=2y

Ta có:2y+2y+8=0

=>4y=-8

=>y=-2

Khi đó x=2y=2.(-2)=-4

Vậy x-y=(-4)-(-2)=(-4)+2=-2

Answer 2

=> x=2y 

2y+2y+8=0

=>4y=8

=>y=2

=>x=4

vậy x-y=2