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13.68×5.7+13.68×5.3-13.68怎么样简算
人气:357 ℃ 时间:2020-03-26 21:31:51
解答
13.68×5.7+13.68×5.3-13.68
=13.68X(5.7+5.3-1)
=136.8
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