Calculate without a calculator and give the results in the reduced format. (Source: Entrance examination for technical training, spring 1991)

a) [[$ -\displaystyle\frac {5} {6} + \displaystyle\frac {3} {2} - \displaystyle\frac {1} {3} $]]

Answer: The answer is .

b) [[$ \displaystyle\frac {2 \displaystyle\frac {1} {4} - \displaystyle\frac {1} {3}} { \displaystyle\frac {1} {4} + 2 \displaystyle\frac {1} {3}} $]]

Answer: The answer is .

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