Question

t^3+3t^2+3t-3,分解因式,紧急情况,

Answer 1

abx^2-(a^2+b^2)x-(a^2-b^2)=(ax+a-b)*(bx-a-b)

x^9+x^6+x^3-3

=(x^9-1)+(x^6-1)+(x^3-1)

=(x^3-1)*(x^6+x^3+1)+(x^3+1)*(x^3-1)+(x^3-1)

=(x^3-1)*(x^6+2x^3+3)

=(x-1)*(x^2+x+1)*(x^6+2x^3+3)

很久不做是不行啊……