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(1-y+x分之y)÷y2-x2分之x
人气:412 ℃ 时间:2020-06-30 01:11:52
解答
=[(x+y)-y]/(x+y)÷[-x/(x+y)(x-y)]
=x/(x+y)×[-(x+y)(x-y)]/x
=-(x-y)
=y-xлл����
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