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0.3×9.9+0.2简便算法
人气:174 ℃ 时间:2020-06-04 20:16:49
解答
0.3×9.9+0.2
=0.3×(10-0.1)+0.2
=0.3×10-0.3×0.1+0.2
=3-0.03+0.2
=3.17
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