Nhân đơn thức :
a) \(\left(-\dfrac{1}{3}m^2\right).\left(-24n\right).4mn\)
\(=-\dfrac{1}{3}.\left(-24\right).4.m^2.n.mn\)
\(=32m^3n^2\)
b) \(5a.a^2b^2.\left(-2b\right)\left(-3a\right)\)
\(=5.\left(-2\right).\left(-3\right).a.a^2b^2.b.a\)
\(=30a^4b^3\)