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2-5/12÷7/24+2/7 简便计算(递等式,
人气:320 ℃ 时间:2020-10-01 06:45:25
解答
2-5/12÷7/24+2/7
=2-5/12x24/7+2/7
=2-10/7+2/7
=2-8/7
=6/7
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