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7.4*0.28+7.2*0.74怎么简算
人气:411 ℃ 时间:2019-10-27 14:34:11
解答
7.4*0.28+7.2*0.74
=0.74x2.8+0.74x7.2
=0.74x(2.8+7.2)
=0.74x10
=7.4
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