若2x+2y=3xy,6y+6z=5yz,3z+3x=4xz求xyz的值如题

若|x-3|+|y+2|+|2z+1|=0,求(xy-yz)(y-x+z) 若Y/X=3/2,Y/Z=3/4.则2XY+YZ/2YZ-XY=多少 若Y/X=3/2,Y/Z=3/4.则(2XY+YZ)/(2YZ-XY)=多少 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) 解方程组（x+y)/xy=5/6,(y+z)/yz=-2/3,2(x+3)+xz=0 若3/x=2/y=5/z则xy+yz+zx/x^2+y^2+z^2=? 设x,y,z∈R+,xy+yz+xz=1,证明不等式:(xy)^2/z+(xz)^2/y+(yz)^2/x+6xyz≥x+y+zRt 若x/3=y/2=z/5则x^2-y^2-z^2/（xy+yz+zx） 已知x:4=y:5=z:6,求x^2+y^2-z^2/xy+xz+yz 已知实数x .y.z.满足2^x=3^y=6^z 求证:xy+yz=xz 1.x,y,z为实数,且xy/x+y=1/3,yz/y+z=1/4,xz/x+z=1/5,求xyz/xy+yz+zx的值.2.若x^2+y^2-2x-6y+10=0,求分式x^2-y^2/xy的值.请一楼回答者写出第二题具体答案！ 若2x+2y=3xy,6y+6z=5yz,3z+3x=4xz求xyz的值如题 若|x-3|+|y+z|+|2z+1|=0,求XY-YZ的值 若｜x-3｜+｜y+z｜+｜2z+1｜=0,求xy-yz的值 若x/3=y/2=z/5,且xy+yz+zx=93,求9x*x+12y*y+2z*z的值. 已知xy/x+y=2/3,yz/y+z=6/5.xz/x+z=3/4求x-z^y 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 如果3y=x+2y,那么x *x+9*y*y+4*z*z-6xy-12yz+4xz的值是多少?