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7-62.

Simplify the following expressions.  

  1.  

    First convert these into fractions greater than one.

    Next, find a common denominator and compute the sums.

  1.  

    Find a common denominator among these three fractions.

    Multiply each fraction by a Giant One to convert each fraction to ensure a common denominator.

    Compute the sum and differences.

  1.  

    See part (a). Note these fractions already have a common denominator.