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简算(5/9×7/10-1/3)×6/5
人气:428 ℃ 时间:2020-03-31 15:43:11
解答
(5/9×7/10-1/3) × 6/5
= 2/3×7/10 - 2/5
= 7/15 - 6/15
= 1/15
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