求数列："1,12,123,1234,12345,123456，….1234567……n，…."的 C# 求一组数1,12,123,1234,12345,123...
\u6c42\u6570\u5217\uff1a"1,12,123,1234,12345,123456\uff0c\u2026.1234567\u2026\u2026n\uff0c\u2026."\u7684\u901a\u9879\u516c\u5f0f~~\u3010\u4f1a\u7684\u7ae5\u978b\u8bd5\u8bd5\u770b\u5427~~\u3011\u7531\u6570\u5217\u5f97\u9012\u63a8\u516c\u5f0f\uff1aa(n+1)=10an+n+1
\u53ef\u5316\u4e3a a(n+1)+n/9+19/81=10(an+(n-1)/9+19/81)
\u56e0\u6b64\uff5ban+(n-1)/9+19/81}\u4e3a\u9996\u9879100/81, \u516c\u6bd4\u4e3a10\u7684\u7b49\u6bd4\u6570\u5217
\u56e0\u6b64\u6709\uff1aan+(n-1)/9+19/81=100/81*10^(n-1)
\u56e0\u6b64\u6709\uff1aan=10^(n+1)/81-n/9-10/8
string func(int n) //n<=9{ if(n<=1) return "1"; return func(n-1)+n.ToString();}
这个是根据等差数列的进行描述的，个人阶段是这样认为的，大家可以多了解一下绛旓細椤规暟鍏紡涓猴細椤规暟=[(灏炬暟-棣栨暟)/鍏樊]+1銆鏁板垪涓」鐨勬讳釜鏁颁负鏁板垪鐨勯」鏁帮紝椤规暟鏄竴涓鏁存暟銆傛棤绌锋暟鍒楁病鏈夐」鏁般傛暟鍒椾腑椤圭殑鎬绘暟涔嬪拰涓烘暟鍒楃殑鈥滈」鏁扳濓紝鍦ㄦ暟鍒椾腑锛岄」鏁版槸涓涓鏁存暟銆傞」鏁板湪绛夊樊鏁板垪涓殑搴旂敤锛氬拰=锛堥椤+鏈」锛壝楅」鏁懊2锛岄」鏁=锛堟湯椤-棣栭」锛壝峰叕宸+1锛岄椤=2鍜屆烽」鏁-鏈...
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