[3+(-1)^n]^n*x^n/n幂级数收敛半径和收敛域
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证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
f(x)=e^x-x 求证(1/n)^n+(2/n)^n+...+(n/n)^n
幂级数[(-1)^n/3^n]x^n (|x|
判断 当n>1时,n*n*n>3n.( )
求极限lim(x→∞)(1/n+2/n+3/n..+n/n)
若(x^2+1/x)^n(n∈N+,n
设集合M={x|x=2n+1,n∈N},N={x|x=3n,n∈N},则M∩N=
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(4x^n-2x^n-1-3x^n+2)÷(-5x^n-1)
计算(x^(2n)+x^n+1)(x^(3n)-x^(2n)+1)
x^n-1(3x^n+4x^n+1-5x^n+2)
x^n*x^n+1*(-x)^2n*x+(-x)^2n+3x^2n-2*x
∞∑ n=1 [(2n-1)/(3^n)]*[x^(2n-2)] ∞∑ n=1 [((-1)^n)/(2n-1)*(x^(2n)
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简