分解因式:(1)12x^2yz-9x^2y^2(2)-x^2-xy-xz(3)p(x-y)+q(y-x)(4)6(2a+
12x^2yz-9x^2y^2 -x^2+xy-xz p(x-y)+q(y-x)
(2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ)
求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ)
化简(2x-y-z/x^2-xy-xz+yz)+(2y-x-z/y^2-xy-yz+xz)+(2x-x-y/z^2-xz
如果3y=x+2y,那么x *x+9*y*y+4*z*z-6xy-12yz+4xz的值是多少?
若x/2=1/y=z/3,且xy+xz+yz=99,求4x^2-2xz+3yz-9y^2的值.
xy/x+y=1,yz/y+z=2,xz/x+z=3求x,y
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
分解因式4x^2-12xy+9y^2-2x+3y-6
如果1=xy/x+y,2=yz/y+z,3=xz/x+z,则x的值?
x^2-xy+y^2 分解因式
若x/3=y=z/4,且xy+xz+yz=76,求2x*x+12y*y+9z*z的值