CPM Homework Help : PC3 Problem 4-49

Rewrite each of the following expressions as a single fraction without negative exponents.

$\large \frac { x ^ { - 1 } y ^ { 2 } + y } { x ^ { - 2 } y ^ { - 1 } + x y ^ { 2 } }$
Hint (a):
Multiply by a Giant One using $x^2y$ .

$\large \frac { x ^ { 2 } y ^ { 3 } + y ^ { - 3 } } { y ^ { - 3 } + x }$
Step (b):
$\frac{x^2y^3+y^{-3}}{y^{-3}+x}\cdot\frac{y^3}{y^3}$