问题标题：
化简求值:[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y,其中x=二分之一,y=2
问题描述：
化简求值:[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y,其中x=二分之一,y=2
黄豫清回答：
[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y=[(x-y)(x+y-x+y)+2y(x-y)]÷4y=[(x-y)2y+2y(x-y)]÷4y=[(x-y)4y]/4y=(x-y)=(1/2-2)=-3/2
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