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9.9×9.9+0.99 简便计算
人气:119 ℃ 时间:2020-01-25 21:07:54
解答
9.9×9.9+0.99 =9.9×9.9+9.9×0.1 =9.9×(9.9+0.1) =9.9×10 =99
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