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7-88.

Simplify each expression.  

  1.  

    Multiply the numerators together and multiply the denominators together. Then simplify.

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    Remember, when you multiply you do not need to line up the decimal points. You do need to decide how many decimal points to put in the answer, however.

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    Find a common denominator then combine.

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    Add the whole numbers together. Find a common denominator for the fractions and add those separately.

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    See part (c).

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    Convert the decimal into a fraction or the fraction into a decimal before combining.