3x4+2x3+3x2+4x-4=0

解线性方程组 X1-2X2+3X3-4X4=0 X2-X3+X4=0 X1+3X2-3X4=0 X解线性方程组X1-2X2+3X3-4X4=0X2-X3+X4=0X1+3X2-3X4=0X1-4X2+3X3-2X4=0 X2+X+1=0 X4+2X3+4X2+3X+2=? 已知x2-3x+1=0,求x4-6x3+4x2+15x+2 用矩阵法姐方程组：2x1-3x2 +x 3-x4 =3 3x 1+x2 +x3 +x 4=0 4x1 -x2 -x 3-x4 =7 -2x 1-x3 +x3 +x4 =-5 线性代数题,求详解设X1,X2,X3,X4是方程X^4+3X^2+4X+5=0的四个根,求D=| X1 X2 X3 X4 | 的值| X4 X1 X2 X3 || X3 X4 X1 X2 || X2 X3 X4 X1 | 解方程组(x1+2x2+2x3+x4=0,2x1+x2-2x3-2x4=0,x1-x2-4x3-3x4=0) 解非线性方程组 x1+2x2+2x3+x4=0 2x1+x2-2x3-2x4=0 x1-x2-4x3-3x4=0 解方程组 x1+2x2+2x3+x4=0 2x1+x2-2x3-2x4=0 x1-x2-4x3-3x4=0 求下面线性规划问题的对偶问题maxZ=x1+x2+2x3+x42x1+3x2+x3-x4≤5x1-x2+6x3+x4≥7x1+x2= -4x1,x3≥0,x2≤0,x4无约束马上要考试落.求下面线性规划问题的对偶问题maxZ=x1+x2+2x3+x42x1+3x2+x3-x4≤5x1-x2+6x3+x4≥7x1+x2= -4x 1+x+x2+x3+x4=0,那1+x+x2+x3+x4+……+x2004=?注意:2 3 4 2004都表示 方 . 用初等行变换来解下列线性方程组（1）2x1-x2+3x3=3 3x1+x2-5x3=0 4x1-x2+x3=3 x1+3x2-13x3=-6(2) x1-2x2+x3+x4=1 x1-2x2+x3-x4=-1 x1-2x2+x3-5x4=5(3) x1-x2+x3-x4=1 x1-x2-x3+x4=0 x1-x2-2x3+2x4=-1/2 X1-X2-3X3+X4=1 X1-X2+2X3-X4=3 2X1-2X2-11X3+4X4=0 4X1-4X2+3X3-2X4=10 用消元法 解线性方程组 求方程组X1-3X2-2X3-X4=1 3X1-8X2-4X3-X4=0 -2X1+X2-4X3+2X4=1 -X1-2X2-6X3+X4=2的解 求线性方程组{X1-3x2-2x3-X4=1;3X1-8X2-4X3-X4=0;-2X1+X2-4X3+2X4=1;-X1-2X2-6X3+X4=2的一般解. .解线性方程组｜X1+X2+X3+X4=5 ｜X1+2X2-X3+4X4=-2 ｜2X1-3X2-X3-5X4=-2 ｜3X1+X2+2X3+11X4=0 用克拉默法则解方程组 X1+X2+X3+X4=5 X1-2X2-X3+4X4=-2 2X1-3X2-X3-5X4=-2 3X1+X2+2X3+11X4=0 X1+X2+X3+X4=5;X1+2X2-X3+4X4=-2;2X1-3X2-X3-5X4=-2;3X1+X2+2X3+11X4=0;多谢 用列主元Gauss消元法解线性方程组{-x2-x3+x4=0,x1-x2+x3-3x4=1,2x1-2x2-4x3+6x4=-1,x1-2x2-4x3+x4=-1