说明代数式[(x-y)²-(x+y)(x-y)]÷(-2y)+y的值,与y的值无关
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[(x-y)²-(x+y)(x-y)]÷(-2y)+y=[(x-y)(x-y-x-y)]÷(-2y)+y=-2y(x-y)÷(-2y)+y=x-y+y=x
化简以后只有x,
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