约分(x^n+2)+(x^n+1)-6x^n/(2x^n+1)+5x^n-(3x^n-1)
计算(x^(2n)+x^n+1)(x^(3n)-x^(2n)+1)
因式分解4x^(n+2)-9x^n+6x^(n-1)-x^(n-2)
C语言 f(x)=1+x+x^2/2!+x^3/3!+...+x^n/n!直到|x^n/n|
x^2n(x^2-2n-2x^1-2n+x^-2n)
求和:Sn=1-3x+5x^2-7x^3+.+(2n+1)(-x)^n(n属于N*)
幂级数[(-1)^n/3^n]x^n (|x|
单项式乘以多项式(x^n-x^n-1+x)*x^n+1(x^2n+1)(-x^2n)(+x^n+2)
求极限lim(x→∞)(1/n+2/n+3/n..+n/n)
信号与系统中 y(n)=x(n)+x(n+1)如果|x(n)|≤M, 则|y(n)|≤|x(n)|+|x(n+1)|≤2
\求和Sn=1+2x+3x^2+```+(n-1)x^(n-2)+n*x^(n-1)
lim[n/(n*n+1*1)+n/(n*n+2*2)+...+n/(n*n+n*n)],当x趋向无穷大时,怎么求极限,
计算x^3n/(x^2-1)-x^2n/(x^n+1)-1/(x^n-1)+1/(x^n+1)