Giải thích các bước giải:
Ta có:
$\dfrac{15}{16} = \dfrac{1}{16} + \left ( \dfrac{1}{16} + \dfrac{1}{16} \right ) + \left ( \dfrac{1}{16} + \dfrac{1}{16} + \dfrac{1}{16} + \dfrac{1}{16} \right ) + \left ( \dfrac{1}{16} + \dfrac{1}{16} + \dfrac{1}{16} + \dfrac{1}{16} + \dfrac{1}{16} + \dfrac{1}{16} + \dfrac{1}{16} + \dfrac{1}{16} \right )$
$= \dfrac{1}{16} + \dfrac{2}{16} + \dfrac{4}{16} + \dfrac{8}{16}$
$= \dfrac{1}{16} + \dfrac{1}{8} + \dfrac{1}{4} + \dfrac{1}{2}$