Cho phân số

- Hướng dẫn giải

Ta có: 

$$\begin{gathered} \frac{15}{16}=\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16} \\ +\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16} \\ =\frac{1}{16}+\left(\frac{1}{16}+\frac{1}{16}\right)+\left(\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}\right) \\ +\left(\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}+\frac{1}{16}\right) \\ =\frac{1}{16}+\frac{2}{16}+\frac{4}{16}+\frac{8}{16} \\ =\frac{1}{16}+\frac{1}{8}+\frac{1}{4}+\frac{1}{2} \end{gathered}$$