1、ab+b²+a-b-2 =ab+a+(b²-b-2)=a(b+1)+(b-2)(b+1)=(a+b-2)(b+1)2、a²-b²+2b-1=a²-(b²-2b+1)=a²-(b-1)²=(a+b-1)(a-b+1)3、x^7-2x^6y+x^5y^2 =x^5·(x²-2xy+y²)=x...