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试说明代数式{(x-y)²-(x+y)(x-y)}÷(-1/2y)+4y的值,与y的值无关
人气:205 ℃ 时间:2020-06-13 20:51:34
解答
{(x-y)²-(x+y)(x-y)}÷(-1/2y)+4y
={2y^2-2xy}÷(-1/2y)+4y
=-4y+4x+4y
=4x
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