2/x=3/y=4/z 求4x^+2yz+z^/x+y-z 乘以 x-z-y/8x^+4yz+2z^要答案结果

已知XY=2(X+Y),YZ=4(Y+Z),ZX=5(Z+X),求X,Y,Z已知XY=2(X+Y),YZ=4(Y+Z),ZX=5(Z+X),求X,Y,Z 方程组xy/x+y=2 yz/y+z=4 zx/x+z=5 求x,y,z 已知2/x=3/y=4/z求4x^2+2yz+z^2/x+y+z*x-y-z/8x^2+4yz+2z^2的值 已知2/x=3/y=4/z,求4x^2+2yz+z^2/x+y+z*x-z-y/8x^2+4yz+2z^2的值 以知1/x=3/y=5/z,求4x^2+2yz+z^2/x+y-z＊x-z-y/8x^2+4yz+2z^2的值. 已知2/x=3/y=4/z,求4x²+2yz+z²/x+y+z×x-y-z/8x²+4yz+2z²的值. 2/x=3/y=4/z 求4x^+2yz+z^/x+y-z 乘以 x-z-y/8x^+4yz+2z^要答案结果 已知x/2=y/3=z/4求(Xy+yz+zx)/(x^2+y^2+z^2) x/3=y/4=z/5 求xy+yz+zx/x^2+y^2+z^2的值 XYZ满足XY/X+Y=-2,YZ/Y+Z=3/4,ZX/Z+X=-4/3,求XYZ/XY+YZ+ZX的值 数学题 xy&x+y =-2,yz&y+z=4&3 zx&z+x=-4&3 求XYZ%xy+xz+yz 当X/2=Y/3=Z/4时,求X-2Y+3Z/XY+2YZ+3YZ的值 已知x /2=y/3=z/4,求代数式x-2y+3z/xy+2yz+3yz的值 已知x>0,y>0,z>0,x(x+y+z)+yz=4-2*根号下3,求2x+y+z的最小值 分式题:xy=x+y,yz=2(y+z),zx=3(z+x),求xyz/(xy+yz+xz)xy=x+y,yz=2(y+z),zx=3(z+x),求xyz/(xy+yz+xz) 若x+2y+z=0,5x+4y-4z=0,求(x^2+ 6y^(2 )-10z^2)/(3x^2 -4yz+5z^2 )的值 注意 是4yz 已知3x-4y-z=0 2x+y-8z=0 求(x^2+y^2+z^2)/(xy+yz+2zx)的值 已知3x-4y-z=0 2x+y-8z=0 求(x^2+y^2+z^2)/(xy+yz+2zx)的值快啊!