1/4(-2x3)^2=5^2

(5^4x3^3-5^3x3^2+5^2x3)÷15=? 1+2x3-4÷5= 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 解方程组 X1-X2-4X3=-1 X2+X3=2 X1+X2-2X3=3线性代数 解线性方程组 x1-x2-x3=2 x1+x2+4x3=0 3x1+5x3=3 x3+x+2 x3-4x2-4x-5 因式分解 设x=(1-√5)÷2则√(x3-1÷x3)x3就是x³ ｛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 3x3÷2x3= 因式分解（1+x+x2+x3)2-x3 max Z=2X1+4X2-5X3 X1+X2+X3=7 2X1-3X2+X3≥10 X1.X2.X3≥0 求解线性方程组-x1+x2+2x3=1;x1-x2+x3=2;5x1-5x2-4x3=1 1/4(-2x3)^2=5^2 非齐次线性方程组求解.x1+x2+2x3+3x4=1 2x1+3x2+5x3+2x4=-3 3x1-x2-x3-2x4=-4 3x1+5x2+2x3-2x4=-10 讨论2X1+X2-X3+X4=1 3X1-2X2+2X3-3X4=2 5X1+X2-X3+2X4=-1 2X1-X2+X3-3X4=4的解的情况 求非齐次线性方程组的通解x1+3x2+5x3-4x4=1x1+3x2+2x3-2x4+x5=-1x1-2x2+x3-x4-x5=3x1+2x2+x3-x4-x5=3 x1-x2+x3=1 x2-x3+x4=2 x3-x4+x5=3 x4-x5+x1=4 x5-x1+x2=5 求x1,x2,x3,x4,x5 maxz=3x1+4x2+x3 -1+2x2+3x3