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枫下沙龙 / 休闲娱乐 / 问题:“今年的正方形菜地比去年的正方形菜地多收了211个卷心菜,请问今年,去年的菜地各多大。”
-nl_nw(no lose&no win);
2003-9-13
(#1368125@0)
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11236 11025
-killer(十步杀一人千里不留行);
2003-9-13
(#1368132@0)
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答案:去年菜地和今年菜地一样大,今年阳光好虫子少肥料足收成高n^2 - m^2 = 211
(n-m)(n+m) = 211(质数)
n-m=1, n+m=211
n=106, m=105
1.n^2 = 11236
2.m^2 = 11025
-bingle(bingle);
2003-9-13
{103}
(#1368136@0)
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你怎么一眼看出某数是质数还是不是?237,731,137,713,173?
-sarskiller(萍沙秋月);
2003-9-14
(#1369115@0)