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数学
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20-19+18-17.+4-3+2-1用简便方法计算下面各题
人气:275 ℃ 时间:2019-08-17 19:51:18
解答
20-19+18-17.+4-3+2-1
=(20-19)+(18-17)+...+(4-3)+(2-1)
=1×10
=10
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