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数学
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简便计算 求(2+5+8+...2000)—1+4+7.+1999
人气:229 ℃ 时间:2020-01-30 03:03:41
解答
2-1=1
5-4=1
8-7=1
实则就是666个1相加.
所以答案就是666.
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