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数学
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当m=3时 求 2m的三次方-[3m的三次方-(4m-5)+m]的值
人气:290 ℃ 时间:2020-03-26 11:58:14
解答
2m³-[3m³-(4m-5)+m]
=2m³-[3m³-4m+5+m]
=2m³-3m³+4m-5-m
=-m³+3m-5
当m=3时,原式=-27+9-5=-23
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