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1/6+1/24+1/60+1/40=
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人气:446 ℃ 时间:2020-05-25 14:09:31
解答
1/6+1/24+1/60+1/40
=4/24+1/24+2/120+3/120
=5/24+5/120
=5/24+1/24
=6/24
=1/4
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