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7.8乘以0.6+0.42,
人气:385 ℃ 时间:2020-06-21 02:14:35
解答
7.8*0.6+0.42=(8-0.2)*0.6+0.42 =8*0.6-0.2*0.6+0.42 =4.8-0.12+0.42 =5.1
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