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第54頁(yè)

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?$=\frac {3}{18}-\frac {2}{18}$?
?$=\frac {1}{18}$?
?$=\frac {9}{12}+\frac {10}{12}$?
?$=\frac {19}{12}$?
?$=\frac {8}{8}-\frac {3}{8}$?
?$=\frac {5}{8}$?
?$=\frac {14}{21}+\frac {12}{21}$?
?$=\frac {26}{21}$?
?$=\frac {25}{35}-\frac {14}{35}$?
?$=\frac {11}{35}$?
?$=\frac {8}{6}+\frac {9}{6}$?
?$=\frac {17}{6}$?
$\begin{aligned}解：x&=\frac {4}{5}+\frac {1}{3}\\x&=\frac {17}{15}\end{aligned}$
$\begin{aligned}解：x&=\frac {3}{2}-\frac {1}{3}\\x&=\frac {7}{6}\end{aligned}$
$\begin{aligned}解：x&=\frac {3}{10}+\frac {4}{5}\\x&=\frac {11}{10}\end{aligned}$
$\begin{aligned}解：x&=\frac {5}{6}-\frac {1}{2}\\x&=\frac {1}{3}\end{aligned}$
$\begin{aligned}解：x&=\frac {7}{10}+\frac {1}{5}\\x&=\frac {9}{10}\end{aligned}$
$\begin{aligned}解：x&=\frac {2}{3}-\frac {2}{7}\\x&=\frac {8}{21}\end{aligned}$
?$\frac {1}{2}+\frac {7}{10}=\frac {6}{5}($?噸)
答：大米一共有?$\frac {6}{5}$?噸。
解：設(shè)晨晨在星期六用?$x$?小時(shí)進(jìn)行體育鍛煉，
?$x-\frac {4}{5}=\frac {1}{6}，$?
解得?$x=\frac {29}{30}，$?
答：晨晨在星期六用?$\frac {29}{30}$?小時(shí)進(jìn)行體育鍛煉.

?$\frac {1}{8}+\frac {1}{12}=\frac {5}{24}$?
答：兩對(duì)合作一天能鋪設(shè)這條管道的?$\frac {5}{24}.$?

?$\frac {1}{8}-\frac {1}{12}=\frac {1}{24}$?
答：兩對(duì)合作一天，甲隊(duì)比乙隊(duì)多鋪這條管道的?$\frac {1}{24}.$?
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