1~990去2、3、5倍數後剩下的合:－線上遊戲排行榜2013/2014,進擊的巨人線上看,candy crush saga外掛,正妹寫真三圍

Sep 07 Sat 2013 08:47
1~990去2、3、5倍數後剩下的合:

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1~990去2、3、5倍數後剩下的合

Sep 6th 2013, 21:12

發問如題1~990中的正整數中，去掉2的倍數...所有數的總和有個解法是這樣： 1/2*990^2*(1-1/2)(1-1/3)(1-1...1/15+1/10-1/30)+990(1-1-1-1+1+1+1-1)] =(1/2)[990^2(1-1/2...

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