若2x=-y,则x²-y²分之xy等于
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若2x=-y,则x²-y²分之xy等于
若2x=-y,则x²-y²分之xy等于
若2x=-y,则x²-y²分之xy等于
若2x=-y,
则x²-y²分之xy
=x*(-2x)/(x²-(-2x)²)
=-2x²/(x²-4x²)
=-2x²/(-3x²)
=2/3
2x=-y
则x/y=-1/2,y/x=-2
x²-y²分之xy=xy分之(x²-y²)的倒数
(x²-y²)/xy
=(x/y)-(y/x)
=-1/2+2
=3/2
所以
x²-y²分之xy
=2/3