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整体去括号;[5(x-y)-3(x-y)-(x-y)+2(x-y)]-2(x-y)
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人气:314 ℃ 时间:2020-05-30 12:12:25
解答
[5(x-y)-3(x-y)-(x-y)+2(x-y)]-2(x-y)
=[3(x-y)]-2(x-y)
=x-y
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