Question

【数学基础题】分解下列各式【1】3b^3+81【2】x^2(y-z)+81(z-y)【3】x^2 y+bxy+9y【4】

Answer 1

= 3（b^3+27)=3（b^3+3^3)=3(b+3)(b^2-3b+9)

=(y-z)(x^2-9^2)=(y-z)(x+9)(x-9)

y(x^2+bx+9)

(x-4)(x-6)