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3.8*4.1-0.38 简算
人气:299 ℃ 时间:2020-03-07 14:17:17
解答
3.8*4.1-0.38
=3.8*4.1-3.8*0.1
=3.8*(4.1-0.1)
=3.8*4
=(4-0.2)*4
=4*4-0.2*4
=16-0.8
=15.2
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