已知x+2y=0(x不等于0）求分式2xy+y2/x2-xy
人气：352 ℃ 时间：2019-11-02 21:13:30
解答
x+2y=0
x=-2y
2xy+y2/x2-xy
=-4y^2+y^2/4y^2+2y^2=-5/6
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