$\"\"$

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The expression is $\"\"$ .

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Product of two same signs is positive)

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$\"\"$ (Product of two different signs is negative) $\"\"$

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Mixed fraction can written as proper fraction.

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$\"\"$ ( $\"\"$ ) $\"\"$

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If $\"\"$ , where b, d, f $\"\"$ .

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$\"\"$

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$\"\"$ (Multiply numerator: $\"\"$ )

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$\"\"$ (Multiply denominator: $\"\"$ )

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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The product is $\"\"$ .