已知3x^2-xy-4y^2=0,且x+y≠0,说明y=3/4x
问题描述:
已知3x^2-xy-4y^2=0,且x+y≠0,说明y=3/4x
答
3x^2-xy-4y^2=0
(x+y)(3x-4y)=0
3x=4y
y=3/4x