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7/9 / 11/5 + 2/9 * 5/11 简便算
人气:353 ℃ 时间:2020-06-10 07:58:07
解答
7/9 / 11/5 + 2/9 * 5/11
=7/9*5/11+2/9*5/11
=(7/9+2/9)*5/11
=1*5/11
=5/11
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