99.99×77.78+33.33×66.66,能不能简便算吗?怎么算?

日期:2014-01-02 19:05:45 人气:2

99.99×77.78+33.33×66.66,能不能简便算吗?怎么算?

原式=99.99×77.78+33.33×66.66 =99.99×77.78+99.99×22.22 =99.99×(77.78+22.22) =99.99×100 =9999
    A+
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