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Oct 22
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“ 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 mooncalf) (via 337) (via 00a) (via clavier) (via vmconverter) (via nerazurinerazuri) (via maharada) (via w01chota)

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