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m分之3+3m分之2m-9
人气:177 ℃ 时间:2020-05-06 22:26:32
解答
3/m+(2m-9)/3m
=9/3m+(2m-9)/3m
=[9+(2m-9)]/3m
=(9+2m-9)/3m
=2m/3m
=2/3.
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