x4+5x3+5x2+5x-6=0

x4+5x3+5x2+5x-6=0 x4-x3-5x2-6x-4 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 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 解线性方程组{2x1-5x2+2x3-3x4=0,x1+2x2-x3+3x4=0,-2x1+14x2-6x3+12x4=0}一般解解线性方程组{2x1-5x2+2x3-3x4=0,x1+2x2-x3+3x4=0,-2x1+14x2-6x3+12x4=0}一般解 求解齐次线性方程组 2x1+3x2-x3-7x4=0 3x1+x2+2x3-7x4=0 4x1+求解齐次线性方程组2x1+3x2-x3-7x4=03x1+x2+2x3-7x4=04x1+x2-3x3+6x4=0x1-2x2+5x3-5x4=0 求解齐次线性方程组 2x1+3x2-x3-7x4=0 3x1+x2+2x3-7x4=0 4求解齐次线性方程组 2x1+3x2-x3-7x4=03x1+x2+2x3-7x4=04x1+x2-3x3+6x4=0x1-2x2+5x3-5x4=0 求下列非齐次线性方程组的解x1+x2-3x3-x4=13x1-x2-3x3+4x4=4x1+5x2-9x3-8x4=0我已经算到x1+x2-3x3-x4=1-4x2+6x3+7x4=1该怎么分别用x1 x2 x3 x4来表示呢? X1 - X3 - X4 -5X5=0 X1+2X2+3X3+3X4+7X5=0 X1+X2+X3+X4+X5=0 X2+2X3+2X4+6X5=0 x1+x2+2x3-x4=0 { -x-3x3+2x4=0 2x1+x2+5x2-3x4=0 的一般解格式是{ 上x1+x2+2x3-x4=0 中 -x-3x3+2x4=0 下2x1+x2+5x2-3x4=0 因式分解：x4+x3+6x2+5x+5 x4-x3-5x2-6x-4分解因式 6x4+5x3+3x2-3x+2因式分解 用克莱姆法则解下列方程组 2X1+X2-5X3+X4=8 X1-3X2-6X4=9 2X2-X3+2X4=-5 X1+4X2-7X3+6X4=0 请指点一道解线性方程组的问题2x1+x2-5x3+x4=8x1-3x2-6x4=92x2-x3+2x4=-5x1+4x2-7x3+6x4=0 线性代数 2X1 - X2 +X3-X4=0 求解线性方程组 ｛ 2X1-X2-3X4=0 X2+3X3-6X4=0 2X1-2X2-2X3+5X4=0 用基础解系表示线性方程组的全部解2X1-X2+X3-X4=0 2X1-X2-3X4=0X2+3X3-6X4=02X1-2X2-2X3+5X4=0 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