因式分解：(1)x^2-y^2-z^2+2yz(2)-x^2+x+2(3)(x-1)(x-3)(x+1)(x+3)-20

(xy-1)^2+(x+y-z)(x+y-zxy)因式分解 (x+y)^2-(x-z)^2,因式分解 (x+y+z)^2-(x-y-z)^2因式分解 (x+y+z)^2 -(x-y-z)^2 化简是因式分解 -(x-y+z)^2+(x+y+z)^2因式分解 (x+2y-z)(x-2y+z)因式分解 因式分解x^2y^2z^2+x^2z+y^2z+1 因式分解 (x+y+z)^2+yz(y+z)+xyz x^2-(y+z)^2 因式分解........... (x-y)^2-(z-m)^2因式分解 因式分解:x^2-(y-z)^2= 因式分解：(x+y-2z)立方+(y+z-2x)立方+(z+x-2z)立方 x`2(x-y)+y`2(y-z)+z`2(z-x)因式分解如题啊 因式分解(x+y-z)*[(x+y)^2+(x+y)*z+z^2]怎么化简 x^2(y-z)+x(z-y)+12(z-y)因式分解解答过程 因式分解Z^2(x-y)-4(x-y)-3Z(y-z) 因式分解x^2(y-x)+81(z-y) （x-y)^3-3z(x-y)^2 因式分解