已知:a+b=5,ab=3 求a^3+3a^2b+3ab^2+b^3

问题描述:

已知:a+b=5,ab=3 求a^3+3a^2b+3ab^2+b^3

a^3+3a^2b+3ab^2+b^3
=(a+b)^3
=5^3
=125