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8m的2次方+【2m的2次方-m-(3m的2次方-4m)】
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人气:490 ℃ 时间:2020-02-03 22:24:36
解答
8m^2+[2m^2-m-(3m^2-4m)]
=8m^2+2m^2-m-3m^2+4m
=(8+2-3)m^2+(-1+4)m
=7m^2+3m
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