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2.012×390+20.12×41+201.2×2 简便计算
人气:321 ℃ 时间:2020-04-27 03:52:30
解答
2.012×390+20.12×41+201.2×2
=2012×0.39+2012×0.41+2012×0.2
=2012×(0.39+0.41+0.2)
=2012×1
=2012
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