(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?
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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