\"\"

\

The expression is \"\"

\

\"\"

\

\"\"          (The product of two integers with same sign is positive)

\

\"\"             (Multiply: \"\")\"\"\"\"         (The product of two integers with same sign is positive)

\

\"\"           (Multiply: \"\")\"\"

\

\"\"             (The product of two integers with different signs is negative)

\

\"\"                    (Multiply: \"\") \"\"

\

The product is \"\".