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分解式子1.xyz-yz-xz-xy+x+y+z-12.x^2y^2+xy-x^2-y^2+x+y+23.a^4+b^4

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分解式子
1.xyz-yz-xz-xy+x+y+z-1
2.x^2y^2+xy-x^2-y^2+x+y+2
3.a^4+b^4+c^4-2a^2b^2-2b^2c^2-2c^2a^2
4.(6x-1)(2x-1)(3x-1)(x-1)+x^2
分解式子1.xyz-yz-xz-xy+x+y+z-12.x^2y^2+xy-x^2-y^2+x+y+23.a^4+b^4
(1)解:原式=(XYZ-YZ)-(XZ-Z)-(XY-Y)+(X-1)
=YZ(X-1)-Z(X-1)-Y(X-1)+(X-1)
=(YZ-Z-Y+1)(X-1)
请问下面几道题上面的符号是什么?
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