1.ax方-ay方=a(x²-y²)=a(x+y)(x-y) 2.（a+b)x方-a-b=(a+b)x²-(a+b)=(a+b)(x²-1)=(a+b)(x+1)(x-1) 3.x的4次方-1 =(x²+1)(x²-1)=(x²+1)(x+1)(x-1)4.（x+a)方-（x+b)方=[(x+a)+(x+b...