a) $\frac{3}{4} = \frac{1\;+\;2}{4} = \frac{1}{4} + \frac{2}{4} = \frac{1}{4} + \frac{1}{2}$.
b) $\frac{3}{4} =\frac{9}{12} = \frac{1\;+\;2\;+\;6}{12} = \frac{1}{12} + \frac{2}{12} + \frac{6}{12} = \frac{1}{12} + \frac{1}{6} + \frac{1}{2}$.
c) $\frac{3}{4} = \frac{27}{36} = \frac{2\;+\;3\;+\;4\;+\;18}{36} = \frac{2}{36} + \frac{3}{36} + \frac{4}{36} + \frac{18}{36}= \frac{1}{18} + \frac{1}{12} + \frac{1}{9} + \frac{1}{2}$.
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