Question

计算：a-6a^2b^3+9a^3b^6 2acd-c^2d-ad^2

Answer 1

a-6a^2b^3+9a^3b^6

=a(9a^2b^6-6ab^6+1)

=a(3ab^3+1)^2 完全平方公式

2acd-c^2a-ad^2

=-a(c^2-2cd+d^2)

=-a(c-d)2