Question

已知a+b=3,ab=2.5，求代数式a^2b+2a^2b^2+ab^2的值

有过程

Answer 1

a^2b+2a^2b^2+ab^2
=ab(a+2ab+b)
=2.5(3+2.5*2)
=20

Answer 2

a^2b+2a^2b^2+ab^2
=ab(a+b)+2(ab)^2
=2.5*3+2*2.5*2.5
=20

Answer 3

解 原代数式=ab(a+2ab+b)=2.5*(3+5)=20