化简2^n+4 -2x2^n除以2x2^n+3得______(麻烦了哈,n_n)

计算:2^n+4-2x2^n除以2x2^n+3 化简2^n+4 -2x2^n除以2x2^n+3得______(麻烦了哈,n_n) (2的n 4次方-2x2的n次方)除以(2x2的n-3次方) Sn=1x2+3x2^2+5x2^3+…+（2n-1）x2^n sn=2sn-sn我想知道2SN等于多于.尤其是（2n-1）x2^n 除以2等于多少. 1+2x2+3x2^2+4x2^3+.+nx2^n-1=? 1+2x2+3x2^2+4x2^3+.+nx2^n-1=? Sn=1x2+3x2^2+5x2^3+...+（2n-1）2^n 1x2+2x3+3x4+4x5+.+n(n+1)+n(n+2)=? 求和Sn=1x2+3x2^2+5x2^3+…+（2n-1）x2^n 1x2^3+2x2^5+3x2^7+…+nx2^2n+1是多少? 化简:x1+2!x2+3!x3+.+n!xn x1+1 x1+2 x1+3 .x1+n x2+1 x2+2 x2+3 .x2+n .xn+1 xn+2 xn+3 .xn+n行列式求解 化简x/x2+x除以x2+x-2/x2-1+x+1/x+2 1x2+2x3+3x4+4x5.n(n+1)等于多少?急救! 已知x2+m+4y2=(x—n)2,求m,n 设整数n>=2,正实数x1,x2,……xn满足(x1+x2+……xn)(1/x1+1/x2+……1/xn)=n^2+1求证：（x1^2+x2^2+……+xn^2）(1/x1^2+1/x2^2+……+1/xn^2)>=n^2+4+2/n(n-1) 求和1x2+3x2^2+5x2^3+…+(2n-1)x2n要详解答案,我采纳!急用! 求和1x2+3x2^2+5x2^3+…+(2n-1)x2n要详解答案,急用!