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锟斤拷锟斤拷某些锟斤拷(sh锟斤拷)锟斤拷前n項猴拷
锟斤拷锟斤拷1+2+3+4+5+6+7+8+9+…+n=n(n+1)/2
锟斤拷锟斤拷1+3+5+7+9+11+13+15+…+(2n-1)=n2 www.Examw.com
锟斤拷锟斤拷2+4+6+8+10+12+14+…+(2n)=n(n+1) 5
锟斤拷锟斤拷1^2+2^2+3^2+4^2+5^2+6^2+7^2+8^2+…+n^2=n(n+1)(2n+1)/6
锟斤拷锟斤拷1^3+2^3+3^3+4^3+5^3+6^3+…n^3=n2(n+1)2/4
锟斤拷锟斤拷1*2+2*3+3*4+4*5+5*6+6*7+…+n(n+1)=n(n+1)(n+2)/3
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