勁急~希望大家協助~thanks

有d數唔識計呀~都唔知點做~希望大家今晚之內可以覆到我！thxs~
1)4a^6 x 5a^3
2)3a^4 x 2a^2 b
3)(6a^3)^2
4)16p^3 x 6p^2
5)7ab^3 除5a^4b^5 x 25a^2 b^2
6)b^n x b^(2n-2)
7)b^n x b^(4n-2) 除b^(3n-2)
8)(7n^4)^2n x (5n^2)^3n
9)18r^n s^2n x 6r^3n s^2n 除(rs)^2n
10)4p^n q^n x 2p^3n q^2n 除(2pq)^3n

好似好多咁~不過真係想大家幫幫忙呀~thxs