已知3x-y+2z=x+2y+3z=0,求(3x^-xy+2y^)/(2x^+4xy+y^)值?
已知3x-y+2z=x+2y+3z=0,求(3x^-xy+2y^)/(2x^+4xy+y^)值?
已知实数x,y,z满足x²-6xy+10y²+4y+|z²-3z+2|+4=0,求(x+y
已知3x-4y-z=0 2x+y-8z =0,求(x²+y²-z²)/(xy+yz)的值
已知三个数x,y,z,满足xy/x+y=-2,yz/y+z=4/3,zx/z+x=-4/3,求(xyz)/(xy+yz+
已知xy/x+y=3,yz/y+z=2,zx/z+x=1,求y的值
1.已知:X+Y+Z=3Y=2Z,求X/X+Y+Z的值 2.已知:1/X-1/Y=3,求2X+3XY-2Y/X-2XY-
已知x+y+z=3y=2z,y不等于0求xy+yz+zx/x的平方+y的平方+z的平方的值
已知实数x,y,z满足x-y=5,z^2=-xy-y-9,求x-2y+3z的值
已知实数x,y,z,满足x+y=5,z²=xy+y=9,求x+2y+3Z的值
已知x y z 满足x+y=5,z²=xy+y-9,求x+2y+3z的值
已知4x-3y-3z=0,x-3y-z=0 求xy+2yz/x²+y²+z²
1.已知3x-4y-z=0,2x+y-8z=0.求x²+y²+z²/xy+yz+2xz 的