bt的数学题.题解看这里:http://www.mydrs.org/dvp/dispbbs.php?boardid=13&id=436842楼说的还算比较详细…我刚开始把题目里P的定义的乘法看成了加法所以一直不懂2楼说的,后来看题之后才发现自己看错了…
{ SGU 169; Numbers - sqybi’s code - Maths}//for my winstyprogram sgu169_sqybi; var n, t: longint;
begin readln(n); if n = 1 then writeln(8) else begin t := 1; if (n - 1) mod 3 = 0 then t := t + 2; if (n - 1) mod 6 = 0 then t := […]
只说一句:图像法解决概率问题真好用.公式见程序.
{ SGU 144; Meeting - sqybi’s code - Maths}//for my winstyprogram sgu144_sqybi; var x, y, z: double;
begin readln(x, y, z); writeln((1-sqr((y-x)*60-z)/sqr((y-x)*60)):0:7); end.
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一道数学题…做法如下:如果log(2, (a+b)/gcd(a, b))是整数,那么它就是答案;否则无解.
Wind牛的证明如下(有删减):
疾风剑客 01:50:46很简单- -
疾风剑客 01:50:51证明
Killa.sqybi 01:50:50哇
Killa.sqybi 01:50:54赞..我要听
疾风剑客 01:51:11显然2个约完该约的是2个奇数吧
疾风剑客 01:51:32如果2个奇数不相等
疾风剑客 01:51:37运算1次后
疾风剑客 01:51:42是2个偶数吧
疾风剑客 01:51:55然后约掉该约的
疾风剑客 01:52:00应该又是2个奇数吧
Killa.sqybi 01:52:04我明白了..
Killa.sqybi 01:52:08最后约到1 1…
疾风剑客 01:52:17否则就无解
疾风剑客 01:52:30而因为每次都是约2
疾风剑客 01:52:35所以是2^n
疾风剑客 01:52:36over
看不懂就算了…网上某牛(flyfox牛吧…)给出的答案有误…
{ SGU 126; Boxes - sqybi’s code}//for my winsty{$APPTYPE CONSOLE}program sgu126_sqybi; const e = 1e-6;
var a, b, g: longint; t: double;
function gcd(x, y: longint): longint; begin if y = 0 then […]
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