We can rewrite your entire number as
You can now use what you know about exponents: Multiplication of two powers preserves the base and adds the exponents. similarly, division of two powers preserves the base and subtracts the power of the denominator from the power of the numerator. You could also note that division by a number is the same as multiplication by its reciprocal. Use whichever you feel most comfortable with:
Since , we have .