已知2x+y=0,求x-2y分之x-y的值,要过程!

问题描述:

已知2x+y=0,求x-2y分之x-y的值,要过程!

y=-2x x+2x除以x+4x=3/5

2x+y=0
y=-2x
所以
x-2y分之x-y
=(x+4x)分之(x+2x)
=5分之3

2x+y=0
则y=-2x
则(x-y)/(x-2y)
=3x/5x
=3/5

x-y/(x-2y)
=(x+2x)/(x+4x)
=3/5