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7.28×0.1+0.5×72.8+0.49×728求简算
人气:389 ℃ 时间:2020-02-05 18:39:13
解答
7.28×0.1+0.5×72.8+0.49×728
=7.28×﹙0.1+5+49﹚
=7.28×54.1
=393.848
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