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9.9*5.5+0.55怎么简算
人气:487 ℃ 时间:2020-02-03 13:54:46
解答
9.9*5.5+0.55
=9.9*5.5+5.5*0.1
=(9.9+0.1)*5.5
=10*5.5
=55
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