=4/3-7/12+9/20+11/30+13+42
=9/12+9/20+11/30+13+42
=45/60+27/60+22/60+13+42
=94/60+55
=1697/30
1又1/3-7/12+9/20+11/30+13+42
1又1/3-7/12+9/20+11/30+13+42
数学人气:553 ℃时间:2020-01-29 10:36:26
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