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9.9乘9.9乘0.99 简便计算
人气:213 ℃ 时间:2020-02-01 06:53:50
解答
9.9乘9.9加0.99
=99×0.1×99×0.1+99×0.01
=99×99×0.01+99×0.01
=(99×99+99)×0.01
=99×100×0.01
=99
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