i need help on simplifying the radical expressions. i know the answers but do not know how to get them. help would be greatly appreciated.

1)square root(6x^2y^4) times (3x^5y)^1/2

2.(cube root(42c^4d^17)) / (6cd^11)^1/3

3.((6x^5y^7)^1/2 times (square root(3x^2y^4)) / square root(2x)

thank you very much.