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设有长度为1,2,3,4,5,6,7,8,9的木棒若干条,从这些木棒中选取三条组成一个三角形,共有多少种不同的方法?
急.
人气:283 ℃ 时间:2019-08-29 06:05:43
解答
95种,如下:111,122,133,144,155,166,177,188,199222,223,233,234,244,245,255,256,266,267,277,278,288,289,299333,334,335,344,345,346,355,356,357,366,367,368,377,378,379,388,389,399444,445,446,447,455,456,...
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