计算(8.42+4.21+4.21)×2.5,下面几种方法计算方法中最简便的方法是( )
人气:304 ℃ 时间:2020-02-02 19:54:28
解答
(4.21+4.21+4.21+4.21)*2.5
=4.21*4*2.5
=4.21*(4*2.5)
=42.1
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