2X1-2+2X2-3+2X3-`4+2X4-5+…十2X99_100十2X100_101

max Z=2X1+4X2-5X3 X1+X2+X3=7 2X1-3X2+X3≥10 X1.X2.X3≥0 解线性方程组 x1-x2-x3=2 x1+x2+4x3=0 3x1+5x3=3 解方程组 X1-X2-4X3=-1 X2+X3=2 X1+X2-2X3=3线性代数 消元法解线性代数4X1+2X2-X3=23X1-X2+2X3=1011X1+3X2 =8 求下面线性规划问题的对偶问题minZ- -x1+3x2-5x3-2x1+6x2-x3≥30X1+4x2-3x3≤20X1-x2+x3- -4X1≤0,x2≥0,x3 无约束 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 求解线性方程组 X1+X2+X3=6 2X1+3X2+X3=11 X1-X2+2X3=5 二次型f(x1,x2,x3)=(x1)^2+3(x2) ^2-4(x3)^2+6(x1)(x2)+10(x2)(x3)的矩阵是 6,若点A(x1,1),B(x2,2),C(x3,-3)在双曲线上,则( ) A,x1>x2>x3 B,x1>x3>x2 C,x3>x2>x1 mathematica如何求解含有三角函数的方程?FindRoot[{3 x1^3 + 2 x2 - 5 + Sin[x1 - x2] Sin[x1 + x2] == 0,-x1*Exp[x1 - x2] + x2 (4 + 3 x2^2) + 2 x3 + Sin[x2 - x3] Sin[x2 + x3] - 8 == 0,-x2*Exp[x2 - x3] + 4 x3 - 3 ==0},{x1,Pi/2},{x2,2},{x3,0}] ｛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 写出下面线性规划的对偶规划min Z=3X1+2X2+X3; X1+X2+X3≤6；X1-X3≥4；X2-X3≥3；X1,X2,X3≥0 线性方程组{2x1-x2-2x3=λx1{5x1-3x2-3x3=λx2{-x1+2x3=-λx3有非零解,则λ= 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 解线性方程组x1+x2+3x3+4x4=5 2x1+4x2+4x3+6x4=8 -x1-2x2-x3-2x4=-3 线性方程组 X1+X2+X3+X4=0,2X1+X2+X3+2X4=0,3X1+2X2+4X3+4=1