reminder 1: , which means, , because...

reminder 2:

so here:

now we want positive powers, so reminder 3: , so...

reminder 4:x^2y^-4/x^-5y^-2

reminder 5: (of course, by i mean multiply)

so,

try this one. i reminders i gave in the first problem should be a big help[(x/y)^-2]^3