$\text { Đáp án: }$
$\frac {2¹⁶–2¹⁴}{2¹⁸–2¹⁶}$
$\text {=}$ $\frac {2².2¹⁴–2¹⁴}{2².2¹⁶–2¹⁶}$
$\text {=}$ $\frac {2¹⁴.(2²–1)}{2¹⁶.(2²–1)}$
$\text {=}$ $\frac {2¹⁴}{2¹⁶}$
$\text {=}$ $\frac {2¹⁴}{2¹⁴.2²}$
$\text {=}$ $\frac {1}{2²}$
$\text {=}$ $\frac {1}{4}$