CPM Homework Help : INT3 Problem 12-17

Simplify each expression below. If you are stuck, use the ideas in problem 12-16.

$\quad \frac { \frac { 1 } { a } + \frac { 1 } { b } } { \frac { 1 } { b } - a }$
Hint (b):
Eliminate all the denominators of the smaller fractions. What will the Giant One look like?
More Help (b):
Distribute: $\frac{ab}{ab} \cdot \frac{ \frac{1}{a} - \frac{1}{b} }{ \frac{1}{b} -a}$