设x1>=x2>=x3>=x4>=2,x2+x3+x4>=x1,求证:(x1+x2+x3+x4)^2
设x1>=x2>=x3>=x4>=2,x2+x3+x4>=x1,求证:(x1+x2+x3+x4)^2
X1+2X2-X3+X4=1
设线性方程组(x1+2x2-2x3+2x4=2,x2-x3-x4=1 x1+x2-x3+3x4=a)
求线性方程组 x2-x3-x4=0 x1+x2-x3+3x4=1 x1-x2+x3+5x4=-1 x1+2x2-2x3+
已知y=4.26X1-2(X2+X3+X4) 且X2>X1 X3>X1 X4>X1 X1+X2+X3+X4=M 求M最小
min= X1+X2+X3+X4+X5
x1+x3+x4=7 x2+x3+x4=6 x2+x1+x4=8 x2+x1+x3=9 求x1 x2 x3 x4 是多少
解方程组X2+X3+X4=1 X1+X2+X3=5 X3+X4+X5=-5 X4+X5+X1=-3 X5+X1+X2=2
求非齐次线性方程组的通解:2x1+x2-x3-x4=1;2x1+x2+x3-x4=1;4x1+2x2+x3-2x4=2
矩阵求非齐次方程组 2*X1+X2-X3+X4=1 4*X1+2*X2-2*X3+X4=2 2*X1+X2-X3-X4=
.解线性方程组|X1+X2+X3+X4=5 |X1+2X2-X3+4X4=-2 |2X1-3X2-X3-5X4=-2 |
求线性方程组一般解,2X1+X2-2X3+3X4=03X1+2X2-X3+2X4=0X1+X2+X3-X4=0