已知3x²+xy-2y²=0.求代数式y分之x-x分之y-xy分之x²+y²的值

已知3x²+xy-2y²=0.求代数式y分之x-x分之y-xy分之x²+y²的值
已知3x²+xy-2y²=0.求代数式y分之x-x分之y-xy分之x²+y²的值

已知3x²+xy-2y²=0.求代数式y分之x-x分之y-xy分之x²+y²的值
3x²+xy-2y²=0
(x+y)(3x-2y)=0
x=-y,或3x=2y
y/x=-1,或3/2
x/y - y/x -(x²+y²)/(xy)
= x/y - y/x - x/y - y/x
= - 2y/x = 2,或-3

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