已知a+b=3,ab=4,求3a^2 b+3ab^2的值.
问题描述:
已知a+b=3,ab=4,求3a^2 b+3ab^2的值.
答
3a^2b+3ab^2
=3ab(a+b)
=3x4x3
=36满意请采纳