1/2+1/15+1/35+1/63+1/99+……+1/(2n-1)(2n+1)(n为正整数)求结果
1/2+1/15+1/35+1/63+1/99+……+1/(2n-1)(2n+1)(n为正整数)求结果
若n为正整数,求1/n(n+1)+1/(n+1)(n+2)+1/(n+2)(n+3)+1/(n+3)(n+4)+.+1/
1\n(n+3)+1\(n+3)(n+6)+1\(n+6)(n+9)=1\2 n+18 n为正整数,求n的值
求limn^2(k/n-1/n+1-1/n+2-…-1/n+k)(其中k为与n无关的正整数)n趋向无穷
m,n,(2m-1)/n,(2n-1)/m为正整数,m,n>=2.求m,n
3)1-2+3-4+5-6+…+(-1)^n+1 n(n为正整数)
1-2 -4 -6…+(-1n+1次方)·n(n为正整数)
1*2+2*3+3*4+4*5+…+n(n+1)(n为正整数)
(-1)的2N加一次方,N等于正整数,求结果
(-1)^2n+(-1)^2n+1+(-1)^2n+2 n为正整数
设n为正整数,证明:6 | n(n + 1)(2n +1).
1-2+3-4+5-6+……+(-1)n+1n(n为正整数 n+1在上面)