need help differentiating (6e^2x-x)^3

also finding the first and second derivatives for f(x)=1-2x over e^x

I used the general power rule to get -2(e^x)-e^x(1-2x) over (ex)^2, but I dont know if thats right and don't know where to go from there to get the second derivative.

Also for this problem e^(x^2+9)times e^(6x)=1 can I just drop the base's because there the same? how would you solve this?

Any help is greatly appreciated thanks.