x+3xy=z 求X/Y

x+3xy=z 求X/Y 若|x-3|+|y+2|+|2z+1|=0,求(xy-yz)(y-x+z) 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) 已知x+y+yz=5,y+z+xy=8,x+z+xy=9,求x,y,z z=f(x+y,xy,x/y),求z对于xy的二次导数 已知4x-3y=6z 2x+4y=14z 求2xy/x^+y^ 已知4x-3y=6z 2x+4y=14z 求2xy/x^+y^ 若xy-z=0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz的值? 若xy-z不等于0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz的值? 若实数x,y,z满足x+y+z=5,xy+yz+xz=3,求z的最大值 实数x,y,z满足x+y+z=5,xy+yz+zx=3,求z的最大值 已知,实数x,y,z满足x+y+z=0,xy+yz+zx=-3,求z的最大值 时数x,y,z满足x+y+z=5,xy+yz+zx=3,求Z最大值 已知XY+X/X+Y+1=2 XZ+2X/X+Z+2=3 (Y+1)(Z+2)/Y+Z+3=4 求X+Y+Z的值已知(XY+X)/(X+Y+1)=2 (XZ+2X)/(X+Z+2)=3 [(Y+1)(Z+2)]/(Y+Z+3)=4 求X+Y+Z的值 已知3x－y+2z=x+2y+3z=0,求（3x^－xy+2y^)/(2x^+4xy+y^)值? 已知xy/(x+y)=1,yz/(y+z)=2,zx/(z+x)=3,求x的值 xy/x+y=1,xz/x+z=2,yz/y+z=3,求x的值 已知1=xy/x+y,2=yz/y+z,3=xz/x+z,求 X的值