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第54頁

信息發(fā)布者：
?$=\frac {3}{18}-\frac {2}{18}$?
?$=\frac {1}{18}$?
?$=\frac {9}{12}+\frac {10}{12}$?
?$=\frac {19}{12}$?
?$=\frac 88-\frac 38$?
?$=\frac 58$?
?$=\frac {14}{21}+\frac {16}{28}$?
?$=\frac {26}{21}$?
?$=\frac {25}{35}-\frac {14}{35}$?
?$=\frac {11}{35}$?
?$=\frac {8}{6}+\frac {9}{6}$?
?$=\frac {17}{6}$?
$\begin{aligned}解：x&=\frac {4}{5}+\frac {1}{3}\\x&=\frac {17}{15}\end{aligned}$
$\begin{aligned}解：x&=\frac {3}{2}-\frac {1}{3}\\x&=\frac {7}{6}\end{aligned}$
$\begin{aligned}解：x&=\frac {3}{10}+\frac {4}{5}\\x&=\frac {11}{10}\end{aligned}$
$\begin{aligned}解：x&=\frac {5}{6}-\frac {1}{2}\\x&=\frac {1}{3}\end{aligned}$
$\begin{aligned}解：x&=\frac {1}{5}+\frac {7}{10}\\x&=\frac {9}{10}\end{aligned}$
$\begin{aligned}解：x&=\frac {2}{3}-\frac {2}{7}\\x&=\frac {8}{21}\end{aligned}$
?$\frac 12+\frac {7}{10}=\frac {6}{5}($?噸)
答：這車大米一共有?$\frac {6}{5}$?噸。
解：設(shè)晨晨在星期六用?$x$?小時進行體育鍛煉。
?$ x-\frac {1}{6}=\frac {4}{5}$?
?        $x=\frac {4}{5}+\frac {1}{6}$?
?        $x=\frac {29}{30}$?
答：晨晨在星期六用?$\frac {29}{30}$?小時進行體育鍛煉。
?$\frac {1}{8}+\frac {1}{12}=\frac {5}{24}$?
答：一天能鋪這條管道的?$\frac {5}{24}。$?
?$\frac {1}{8}-\frac {1}{12}=\frac {1}{24}$?
答：甲隊比乙隊多鋪這條管道的?$\frac {1}{24}。$?
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