第91页

信息发布者：
5x
1
12
1
3
30
30=2×3×5
复式条形
$\frac{7}{10}$
D
C
$\frac{1}{3} + \frac{1}{6} + \frac{1}{12} + \frac{1}{24} + \frac{1}{48}$
$= \frac{1}{3} + \frac{1}{6} + \frac{1}{12} + \frac{1}{24} + \frac{1}{48} + \frac{1}{48} - \frac{1}{48}$
$= \frac{1}{3} + \frac{1}{6} + \frac{1}{12} + \frac{1}{24} + \frac{1}{24} - \frac{1}{48}$
$= \frac{1}{3} + \frac{1}{6} + \frac{1}{12} + \frac{1}{12} - \frac{1}{48}$
$= \frac{1}{3} + \frac{1}{6} + \frac{1}{6} - \frac{1}{48}$
$= \frac{1}{3} + \frac{1}{3} - \frac{1}{48}$
$= \frac{2}{3} - \frac{1}{48}$
$= \frac{31}{48}$
上一页 下一页