第102页

信息发布者:
$解:x=\frac {7}{8}-\frac {3}{4}$
$x=\frac{1}{8}$
$解:x=\frac {5}{18}+\frac {2}{7}$
$x=\frac{71}{126}$
$解:x=\frac {5}{6}-\frac {2}{5}$
$x=\frac{13}{30}$ 
$=\frac {20+12+25}{40}$
= $\frac{57}{40}$
= $\frac{1}{4}$
$=(\frac {17}{8}-\frac {7}{8})-(\frac {2}{3}+\frac {1}{3})$
= $\frac{1}{4}$
= 15
$=(\frac {5}{7}+\frac {2}{7})-(\frac {7}{17}+\frac {10}{17})$
$= 0 $
$=\frac {5}{182}+\frac {14}{15}$
= $\frac{2623}{2730}$
$\frac {1}{3}\gt \frac {1}{4}\gt \frac {1}{5}$
$答: 苹果要多进,香蕉要少进。 $
$\frac {7}{4}\gt \frac {13}{10}\gt \frac {9}{8}$
$ 答:剑鱼速度最快。 $
$1-\frac {1}{5}-\frac {1}{8}$= $\frac{27}{40}$
$答:满天星占\frac {27}{40}。$