拆(添)项法,x^3-7x^2+6和x^3-9x^2+26x
问题描述:
拆(添)项法,x^3-7x^2+6和x^3-9x^2+26x
第二个是x^3-9x^2+26x+24,
答
x^3-7x^2+6=x^3-x^2--6x^2+6=(x^3-x^2)-(6x^2-6)
=x^2(x-1)-6(x+1)(x-1)=(x-1)(x^2-6x-6)