Question

a^7-ab^6 因式分解

Answer 1

a^7-ab^6=a(a^6-b^6)

=a(a^3+b^3)(a^3-b^3)

=a(a+b)(a^2-ab+b^2)(a-b)(a^2+ab+b^2)

=a(a-b)(a+b)(a^2-ab+b^2)(a^2+ab+b^2)