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第14頁(yè)

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1
$\frac{2}{5}$
$\frac{2}{35}$
$\frac{1}{5}$
$1\frac{1}{3}$
$2\frac{1}{5}$
$\frac{13}{21}$
$\frac{2}{3}$
$\begin{aligned}解：x-\frac {19}{12}&=\frac {1}{2}\\x&=\frac {25}{12}\end{aligned}$
$\begin{aligned}解：x-\frac {1}{4}&=\frac {7}{12}\\x&=\frac {5}{6}\end{aligned}$
?$=\frac {17}{10}-\frac {4}{15}$?
?$=\frac {43}{30}$?
?$=(\frac {3}{7}+\frac {4}{7})+(\frac {7}{13}-\frac {6}{13})$?
?$=1+\frac {1}{13}$?
?$=1 \frac {1}{13}$?
?$=9-(\frac {5}{12}+\frac {7}{12})$?
?$=9-1$?
?$=8$?
?$=(\frac {5}{8}-\frac {3}{8})+(\frac {1}{6}+\frac {5}{6})$?
?$=\frac {1}{4}+1$?
?$=\frac {5}{4}$?
?$\frac {5}{21}$?
?$\frac {35}{36}$?
?$\frac 23$?
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