X1+X2+X3+X4=5;X1+2X2-X3+4X4=-2;2X1-3X2-X3-5X4=-2;3X1+X2+2X3+11X4=0;多谢

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 求解非齐次线性方程组x1-2x2+x3+x4=1,x1-2x2+x3-x4=-1,x1-2x2+x3-5x4=5的解 用初等行变换解线性方程组 x1-2x2+x3+x4=1 x1-2x2+x3-x4=-1 x1-2x2+x3-5x4=5 解方程组X1-2x2+3x3-x4=1,3x1-x2+5x3-3x4=2,2x1+x2+2x3-2x4=3 线性代数球全部解X1- X2 +2X3 +2X4=入2X1+X2 +4X3+ X4=5X1+2X2+2X3 - X4 =4 解一道方程组x1+x2+x3=5,x2+x3+x4=1,x3+x4+x5=-5,x4+x5+x1=-3,x5+x1+x2=2 解线性方程组x1+x2+x3+x4=2;2x1+3x2+4x3+3x4=5;x1+3x2+5x3+3x4=4 解线性方程组x1+x2+3x3+4x4=5 2x1+4x2+4x3+6x4=8 -x1-2x2-x3-2x4=-3 求解下列非齐次线性方程组!x1-2x2+3x3-x4=13x1-x2+5x3-3x4=22x1+x2+2x3-2x4=3 求齐次线性方程组 X1+X2-X3-X4=0 2X1-5X2+3X3+2X4=0 7X1-7X2+3X3+X4=0 x1+5x2-x3-x4=-1x1-2x2+x3+3x4=33x1+8x2-x3+x4=1 求非齐次线性方程组的基础解析X1+2X2+X3-X4=43X1+6X2-X3-3X4=85X1+10X2+X3-5X4=16 运筹学……对偶问题.maxz=x1+2x2+3x3+4x4-x1+x2-x3-3x4=56x1-7x2+3x3-5x4 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 求解线性方程组X1-X2+X4=2,X1-2X2+X3+4X4=3,2X1-3X2+X3+5X4=5 求解线性方程组的一般解方程组为 x1-x2+x4=2x1-2x2+x3+4x4=32x1-3x2+x3+5x4=5 用高斯消元法解下列线性代数方程组X1+2X2-X3-2X4=22X1-X2+X3-2X4=3X1-2X2+X4=-5 求齐次线性方程组X1+X2+2X2-X4=0,-X1-3X3+2X4=0,2X1+X2+5X3-3X4=0的一般解.