x1+x3+x4=7 x2+x3+x4=6 x2+x1+x4=8 x2+x1+x3=9 求x1 x2 x3 x4 是多少?

x1+x3+x4=7 x2+x3+x4=6 x2+x1+x4=8 x2+x1+x3=9 求x1 x2 x3 x4 是多少? 求齐次线性方程组 X1+X2-X3-X4=0 2X1-5X2+3X3+2X4=0 7X1-7X2+3X3+X4=0 运筹学……对偶问题.maxz=x1+2x2+3x3+4x4-x1+x2-x3-3x4=56x1-7x2+3x3-5x4 用克拉默法则解下列方程组 x1-2x2+3x3-4x4=4 x2-x3+x4=-3 x1+3x2+2x4=1 -7x2+3x3+x4=3x1-2x2+3x3-4x4=4x2-x3+x4=-3 x1+3x2+2x4=1 -7x2+3x3+x4=3 用线性代数解x1+3x2+5x3+7x4 =12,3x1+5x2+7x3+x4=0,5x1+7x2+x3+3x4=1,7x1+x2+3x3+5x4=16 求线性方程组 X1+X2+X3+X4=4;2X1+2X2+2X3+X4=7;3X1+3X2+3X3+X4=10;5X1+5X2+5X3+2X4=17 的通解 判断下列齐次线性方程组是否有非零解x1+3x2-9x3+7x4=0-3x1-x2+8x3+x4=0 x1-3x2+5x3-x4=0 x1+x2-2x3+3x4=0 齐次线性方程求解：X1-X2+5X3-X4=0X1+X2-2X3+3X4=03X1-X2+8X3+X4=0X1+3X2-9X3+7X4=0 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 解方程组:x1+x2+x3+x4+x5=7 3x1+2x2+x3+x4-3x5=－2 x2+2x3+2x4+6x5=23 5x1+4x2-3x3+3x4-x5=10 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 求齐次线性方程组 x1-x2+5x3-x4=0;x1+x2-2x3+3x4=0;3x1-x2+8x3+x4=0;x1+3x2-9x3+7x4=0.基础解系和通解?得到等价方程组为：x1=-3/2*x3-x4;x2=7/2x3-2x4.此时令x3=1,x4=0,得到x1,x2,进而得到基础解系,再令x3=0,x4=1,得到x1,x2, 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 ｛2X1-X2+3X3=33X1+X2-5X3=04X1-X2+X3=3X1+3X2-13X3=-6{X1-2X2+3X3-4X4=4X2-X3+X4=-3X1+3X2-3X4=1-7X2+3X3+X4=-3 用克莱姆法则解下列线性方程组.x1-2x2+3x3-4x4=4,0+x2-x3+x4=-3,x1+3x3+0+x4=1,0-7x2+3x3+x4=-3 急 求齐次线性方程组x1-x2+2x3+x4=0.2x1+x2-x3-x4=0.x1+x2+3x4=0.x2+x3+7x4=0.的基础解系及其结构解 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