12/03/2011 23:00:29
"好きな３桁の数字を適当に考える
たとえば236
それを二回続ける
236236
このようにしてできた数字は必ず7で割り切れるのだ"
--
好きな３桁の数字を適当に思い浮かべて下さい｜2chコピペ保存道場
元の数＝100a+10b+cとすると2回続けて出来る数は
100000a+10000b+1000c+100a+10b+c
=100100a+10010b+1001c
=1001(100a+10b+c) ←1001で割り切れる（米１
=7*11*13(100a+10b+c)
よって、7だけでなく11・13でも割り切れる。
No.64647 | 2009-07-29 18:25 名無しのコピペ ◆mQop/nM
(via sametimesameplace) (via theemitter) (via msnr) (via yokan) (via tuvuan) (via jinon) (via wideangle)
2009-11-02
(via gkojax-text) (via ishida) (via soothingnoise) (via s-wool) (via sakuma) (via n13i) (via kissmyhipbone)
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