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6.28*7.2+0.28*62.8的简便运算
人气：450 ℃　时间：2020-02-21 17:32:06
解答
6.28*7.2+0.28*62.8
=6.28*7.2+2.8*6.28
=6.28*(7.2+2.8)
=6.28*10
=62.8
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