因式分解 3x^2-11xy+6y^2-xz-4yz-2z^2
(2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ)
因式分解x^2-xy+xz-yz
求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ)
因式分解x^2+y^2+z^2+2xy+2yz+2xz-2x-2y-2z+1
化简(2x-y-z/x^2-xy-xz+yz)+(2y-x-z/y^2-xy-yz+xz)+(2x-x-y/z^2-xz
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
若x/2=1/y=z/3,且xy+xz+yz=99,求4x^2-2xz+3yz-9y^2的值.
x^2+y^2+xy=25/4,x^2+z^2+xz=169/4,y^2+z^2+yz=36,求xy+xz+yz
如果3y=x+2y,那么x *x+9*y*y+4*z*z-6xy-12yz+4xz的值是多少?
解方程组(x+y)/xy=5/6,(y+z)/yz=-2/3,2(x+3)+xz=0
xy/x+y=1,yz/y+z=2,xz/x+z=3求x,y
一道因式分解难题因式分解(y^2-z^2)(1+xy)(1+xz)+(z^2-x^2)(1+yz)(1+yx)+(x^2