15x^2n+3-25x^n+1+5x^n-1
计算(x^(2n)+x^n+1)(x^(3n)-x^(2n)+1)
求和:Sn=1-3x+5x^2-7x^3+.+(2n+1)(-x)^n(n属于N*)
C语言 f(x)=1+x+x^2/2!+x^3/3!+...+x^n/n!直到|x^n/n|
设全集U={x∈N/2≤x≤30},集合A={x/x=2n,n∈N+,且n≤15},B={x/x=3n+1,n∈N+,且
幂级数[(-1)^n/3^n]x^n (|x|
分解因式:-2X^(5n+1)Y^n+4X^(3n+1)Y^(n+2)-2X^(n+1)Y^(n+4)
x^2n(x^2-2n-2x^1-2n+x^-2n)
因式分解4x^(n+2)-9x^n+6x^(n-1)-x^(n-2)
-1+3-5+...+(-1)^n(2n-1)=(-1)^n X n
求极限lim(x→∞)(1/n+2/n+3/n..+n/n)
\求和Sn=1+2x+3x^2+```+(n-1)x^(n-2)+n*x^(n-1)
计算x^3n/(x^2-1)-x^2n/(x^n+1)-1/(x^n-1)+1/(x^n+1)