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1/(3/4+1/3)*39怎么简算
人气:334 ℃ 时间:2020-06-05 04:55:55
解答
1/(3/4+1/3)*39
=12/(3/4×12+1/3×12)*39
=12/(9+4)*39
=12/13*39
=12*3
=36
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