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1/105÷[1/7一(-1/3)-1/5]
人气:328 ℃ 时间:2020-09-28 02:30:17
解答
1/105÷[1/7一(-1/3)-1/5]
=1/105÷(1/7+1/3-1/5)
=1/105÷(1/7+1/15)
=1/105÷22/105
=1/22
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