$\"\"$

\

The expression is $\"\"$ .

\

Remember the product of two improper fractions $\"\"$ . \

\

Rewrite 4, and 9 as $\"\"$ respectively.

\

$\"\"$

\

The product of two same signs is negative and cancel common terms.

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

The value of expression is $\"\"$ .

\