因式分解:x^2+2y^2-z^2+3xy-yz
因式分解 (x+y+z)^2+yz(y+z)+xyz
(2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ)
证明 (x+y+z)^2>3(xy+yz+zx)
因式分解x^2+y^2+z^2+2xy+2yz+2xz-2x-2y-2z+1
因式分解x²-y²-z²+2yz
已知三个数x,y,z,满足xy/x+y=-2,yz/y+z=4/3,zx/z+x=-4/3,求(xyz)/(xy+yz+
求(2X+Z-Y)/(X^2-XY+XZ-YZ)-(2X+Y+Z)/(X^2+XY+XZ+YZ)
因式分解x^2-xy+xz-yz
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
已知xy:yz:zx=3:2:1,求①x:y:z ②x/yz:y/zx
5yz/(y+z)=6,4xy/(z+x)=3,3xy/x+y=2
若|x-3|+|y+z|+|2z+1|=0,求xy-yz的值