5✘6表示几个几相加 教育/科学 -> 理工学科 -> 数学
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\u603b\u4e4b\uff0c\u5728\u5b66\u4e60\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u8981\u8ba4\u8bc6\u5230\u5b66\u4e60\u7684\u91cd\u8981\u6027\uff0c\u5145\u5206\u53d1\u6325\u81ea\u5df1\u7684\u4e3b\u89c2\u80fd\u52a8\u6027\uff0c\u4ece\u5c0f\u7684\u7ec6\u8282\u6ce8\u610f\u8d77\uff0c\u517b\u6210\u826f\u597d\u7684\u5b66\u4e60\u4e60\u60ef\uff0c\u4ee5\u57f9\u517b\u601d\u8003\u95ee\u9898\u3001\u5206\u6790\u95ee\u9898\u548c\u89e3\u51b3\u95ee\u9898\u7684\u80fd\u529b\u3002 \uff01
\u9ebb\u70e6\u91c7\u7eb3\uff0c\u8c22\u8c22!
\u89c4\u5f8b
1 1
2 1+3+1
3 1+3+5+3+1
4 1+3+5+7+5+3+1
..................
n 1+3+5+7+...+(2n-3)+(2n-1)+(2n-3)+....+7+5+3+1
\u76f8\u5f53\u4e8e\u6b63\u5947\u6570\u524dn\u9879\u548c\u76842\u500d\u51cf\u53bb\u7b2cn\u9879
\u56e0\u6b64
f\uff08n\uff09=2* \u3010n(1+(2n-1))\u3011/2-(2n-1)
=2*\u3010n*2n\u3011/2-2n+1
=2n^2-2n+1
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