6.9×9.9+31×0.99的简便方法
人气：463 ℃ 时间：2020-06-17 20:17:14
解答
6.9×9.9+31×0.99
=6.9x10-6.9x0.1+31x1-31x0.01
=69-0.69+31-0.31
=69+31-0.69-0.31
=100-1
=99
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