Do you perhaps mean "aboutsimplifying expressions with exponents"...? Because I'm not seeing any division in the powers in what you've posted...?

Use themeaning of exponentsto expand the expression, if you're not sure what to do:

. . . . .

. . . . .

In the first fraction you can cancel the common factor of 2. In the second fraction, you have ten copies of on top, and seven underneath. How many extra do you have? (10 - 7 = 3) Where are they? (on top)

. . . . .

In the next fraction, you have thirteen copies of on top, and eleven underneath. How many extra do you have? (13 - 11 = 2) Where are they? (on top)

. . . . .

Simplify the last bit in the same way, and then put the fraction back together.

Note: Yes, you can end up with something more interesting in your denominator than just "1". It just so happens that this does not occur in the two examples you posted. But you should expect to see this in other exercises.

. . . . .

. . . . .

. . . . .

. . . . .