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1.各个数位上数的和等于12的三位数有多少个?2.一本书共124页,印刷排版这本书的页码,一共用多少数字?
人气:269 ℃ 时间:2019-08-22 12:48:10
解答
58个921,912,129,219,192,291;813,831,138,318,183,381;822,282,228;840,804;714,741,147,174,417,471;723,732,237,273,327,372;750,705;606,660615,651,156,165,516,561;624,642,246,264,462,426,633,336,3...
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