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4(m+1)^2-(1+2m)(2m-1)
人气:101 ℃ 时间:2020-06-28 20:02:34
解答
4(m+1)^2-(1+2m)(2m-1)
=4(m^2+2m+1)-(4m^2-1)
=4m^2+8m+4-4m^2+1
=8m+5
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