第19页

信息发布者:
16
4
4
$1+2+3+4+\dots+98+99+100+99+98+\dots+4+3+2+1$
$=100×100$
$=10000$
$\dfrac{3}{4}$
$\dfrac{7}{8}$
$\dfrac{15}{16}$
$\dfrac{31}{32}$
1
$\dfrac{1}{256}$
$\dfrac{255}{256}$
$1-\dfrac{1}{2}-\dfrac{1}{4}-\dfrac{1}{8}-\dots-\dfrac{1}{128}$
$=1-(\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dots+\dfrac{1}{128})$
$=1-(1-\dfrac{1}{128})$
$=\dfrac{1}{128}$