:(1)x的三次方+x的平方-2=x³-x²+2x²-2x+2x-2=x²(x-1)+2x(x-1)+2(x-1)=(x-1)(x²+2x+2)(2)x的三次方-7x+6=x³-x²+x²-x-6x+6=x²(x-1)+x(x-1)-6(x-1)=(x-1)(x²+x-6)=(...