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2/m-3+12/9-m^2
人气:403 ℃ 时间:2020-06-15 09:36:05
解答
2/m-3+12/9-m^2
=2/(m-3)-12(m-3)(m+3)
=[2(m+3)-12]/(m+3)(m-3)
=2(m-3)/(m+3)(m-3)
=2/(m+3)
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