Đáp án:
$\dfrac{1}{2}$ +$\dfrac{1}{4}$ +$\dfrac{1}{8}$ +$\dfrac{1}{16}$ + $\dfrac{1}{32}$
= 1 - $\dfrac{1}{2}$ + $\dfrac{1}{2}$ -$\dfrac{1}{4}$ +$\dfrac{1}{4}$+ $\dfrac{1}{8}$ - $\dfrac{1}{8}$-$\dfrac{1}{16}$ +$\dfrac{1}{16}$-$\dfrac{1}{32}$
= 1- $\dfrac{1}{32}$
=$\dfrac{31}{32}$