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计算:x+y分之2+x的平方-y的平方分之4y
人气:490 ℃ 时间:2020-03-24 20:22:59
解答
原式=2(x-y)/(x+y)(x-y)+4y/(x+y)(x-y)
=(2x-2y+4y)/(x+y)(x-y)
=2(x+y)/(x+y)(x-y)
=2/(x-y)
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