设x,y>=0,2x+y=6,求z=4x^2+3xy+y^2-6x-3y的范围
若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值
已知实数x,y,z满足x²-6xy+10y²+4y+|z²-3z+2|+4=0,求(x+y
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值
若:X^2-4X+Y+6Y+√ Z-3+13=0求(xy)^z的值
设变量xy满足约束条件x-y≥0,x+y-2≥0,3x-y-6≤0则目标函数z=2x-y
已知3x-y+2z=x+2y+3z=0,求(3x^-xy+2y^)/(2x^+4xy+y^)值?
设变量x,y,z满足约束条件:x+y+z=1,0≤x≤1,0≤y≤2,3y+z≥2,求F=3x+6y+4z的最大值.
设xy满足约束条件x≥0,x≥y,2x-y≤1,求z=3x+2y的最大值
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.
已知实数X,Y,Z满足 X²-6XY+10Y²+4Y+∣Z²-3Z+2∣+4=0,求(X+