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通分m-15/m^2-9与2/3-m
人气:304 ℃ 时间:2020-04-15 17:11:55
解答
m^2-9=(m+3)(m-3)
所以
(m-15)/(m^2-9)=(m-15)/(m+3)(m-3)
2/(3-m)=-2(m+3)/(m+3)(m-3)
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