①x5-x3-x2+1=x³(x²-1)-(x²-1)=(x²-1)(x³-1)=(x-1)²(x+1)(x²+x+1)②（x-1）（x-2）（x+2）（x+3）-60 =(x-2)(x+3)(x-1)(x+2)-60=(x²+x-6)(x²+x-2)-60=(x²+x)&#...