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数学
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6.15X9.4_42的简便算式
人气:174 ℃ 时间:2020-06-02 02:10:04
解答
(6+0.15)X(9+0.4)-42
=6X9+6X0.4+0.15X9+0.15X0.4-42
=54+2.4+1.35+0.06-42
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