x/2=y/3=z/4,则x²-2y²+3z²/xy+2yz+3xz的值是——要过程啊快快
x/2=y/3=z/4,则x²-2y²+3z²/xy+2yz+3xz的值是——要过程啊快快
如果1=xy/x+y,2=yz/y+z,3=xz/x+z,则x的值?
已知4x-5y+2z=0,x+4y-3z=0,求(x²+y²+z²)/xy+yz+xz
x/3=y/2=z/5,求xy+yz+xz/x²+y²+z²
已知x-y=1/2+√3,y-z=1/2-√3,求x²+y²+z²-xy-xz-yz的值
已知x+y+z=1,x²+y²+z²=2求xy+yz+xz的值
若x/3=y=z/4,且xy+xz+yz=76,求2x*x+12y*y+9z*z的值
x-3=y-2=z-1,求x^2+y^2+z^2-xy-yz-xz的值
已知x:y:z=1:2:3,xy+yz+xz=66,求2x²+12y²-9z²的值.
若x/2=1/y=z/3,且xy+xz+yz=99,求4x^2-2xz+3yz-9y^2的值.
如果3y=x+2y,那么x *x+9*y*y+4*z*z-6xy-12yz+4xz的值是多少?
已知1=xy/x+y,2=yz/y+z,3=xz/x+z,求x+y+z的值