计算:1/2+(1/3+2/3)+。。。。。(1/50+2/50+。。。。。+49/50) 计算:1/1X2+1/2x3
一道简便计算数学题1X2+2X3+3X4+4X5...+n(n+1)一1X2+2X3+3X4+4X5...+2013X2
计算1x2+2x3+3x4+4x5+...+99x100
编写程序计算级数ex=1+x+x2/2!+x3/3!+...+xn/n!的值.
题目给出两组基x1,x2,x3和y1,y2,y3定义线性变换Txi=yi(i=1,2,3)分别计算T在基x1,x2,x3
因式分解(1+x+x2+x3)2-x3
一列数:X1、X2、X3、.、Xn、Xn+1、.,其中X1=3 (1)如果对任意的n,有Xn+1=Xn+2 计算X2=(
1+2x4-(x2+2x3)
先观察,再计算1-1/2=2/1x2-1/1x2=1/2 1/2-1/3=3/2x3-2/2x3=1/2x3=1/6 1
求线性方程组 x2-x3-x4=0 x1+x2-x3+3x4=1 x1-x2+x3+5x4=-1 x1+2x2-2x3+
设线性方程组(x1+2x2-2x3+2x4=2,x2-x3-x4=1 x1+x2-x3+3x4=a)
1/1x2+1/2x3+1/3x4+1/4x5+.+1/2007x2008=多少 怎么计算
计算:1/1x2+1/2x3+1/3x4+1/4x5+……1/39x40