若2x=-y,则分式(xy)/(x²-y²)=_____

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若2x=-y,则分式(xy)/(x²-y²)=_____若2x=-y,则分式(xy)/(x²-y²)=_____若2x=-y,则分式(xy)/(x²-

若2x=-y,则分式(xy)/(x²-y²)=_____
若2x=-y,则分式(xy)/(x²-y²)=_____

若2x=-y,则分式(xy)/(x²-y²)=_____
即y=-2x
所以y²=4x²
xy=-2x²
所以原式=-2x²/)x²-4x²)
=-2x²/(-3x²)
=2/3