1x2+2x3+3x4+·······+101x101=什么
1x2+2x3+3x4+4x5······100x101答案是几?
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
设实数x1,x2,x3,x4,x5均不小于1,且x1·x2·x3·x4·x5=729,则max{x1x2,x2x3,x3
1/1X2+1/2X3+1/3X4···+1/2006X2007(怎么做呀)
2/1x3 + 2/3x5 + 2/5x7 +······+ 2/97x99 + 2/99x101 简便计算
数学题目,求速度1x2十2x3+…+100x101=1x2+2x3+…+n(n十1) 1x2x3+2+3x4+…+n(n
有一列数:第一个数x1=1第二个数x2=3第三个数开始,依次几位x3,x4···从第二个数
求线性方程组 x2-x3-x4=0 x1+x2-x3+3x4=1 x1-x2+x3+5x4=-1 x1+2x2-2x3+
求齐次线性方程组x1+2x2+x3+x4+x5=1 2x1+4x2+3x3+x4+x5=2 -x1-2x2+x3+3x4
设线性方程组(x1+2x2-2x3+2x4=2,x2-x3-x4=1 x1+x2-x3+3x4=a)
具体写出方程组:2x1+x2-x3+x4=1;x1+2x2+x3-x4=2;x1+x2+2x3+x4=3的通解
解方程组X2+X3+X4=1 X1+X2+X3=5 X3+X4+X5=-5 X4+X5+X1=-3 X5+X1+X2=2