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计算.3(x-y)²/(y-x)³·(x-y)²÷9/y-x
人气:411 ℃ 时间:2020-04-15 21:57:10
解答
3(x-y)²/(y-x)³·(x-y)²÷9/y-x
=3/(y-x)× (y-x)³/9
=(y-x)²/3
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