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3m-1)(m+1)+(2m-1)(m-1)-(3m+5)(m-2)怎么计算?
人气:129 ℃ 时间:2019-10-28 22:08:33
解答
(3m-1)(m+1)+(2m-1)(m-1)-(3m+5)(m-2)
=3m²+2m-1+2m²-3m+1-3m²+m+10
=2m²+10
=2(m²+5)
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