已知x+y=-6求[(x+y)^2-(x-y)^2+2y(y-x)]*1/4y的值没分了 抱歉
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已知x+y=-6求[(x+y)^2-(x-y)^2+2y(y-x)]*1/4y的值没分了 抱歉
已知x+y=-6求[(x+y)^2-(x-y)^2+2y(y-x)]*1/4y的值
没分了 抱歉
已知x+y=-6求[(x+y)^2-(x-y)^2+2y(y-x)]*1/4y的值没分了 抱歉
已知:x+y=-6,则X=﹣6﹣Y
原式=[﹙﹣6﹣Y+Y﹚² -﹙﹣6﹣Y-Y﹚²﹢2y﹙y+6+y﹚]×1/4y
=﹙36-36-24y-4y²+4y²+12y﹚×1/4y
=﹣12y×1/4y
=﹣3
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