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数学
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(2m-3n+2)(2-2m+3n)?
人气:194 ℃ 时间:2020-05-31 22:36:31
解答
(2+(2m-3n))(2-(2m-3n))然后就回了吧?会谢谢你!就是搞不清符号怎么变(a+b-c)(a-b+c?)???(a+(b-c))(a-(b-c))都是一样的道理,换个数而已
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