計算:3a³;b²;÷a²;+b*(a²;b-3ab-5a²;b)

計算:3a³;b²;÷a²;+b*(a²;b-3ab-5a²;b)

3a3b2÷a2+b*(a2b-3ab-5a2b)
=3ab2+ab2(a-3-5a)
=3ab2+ab2(-3-4a)
=3ab2-3ab2-4a2b2
=-4a2b2