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第118頁(yè)

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C
$\frac{4}{7}$
$1\frac{1}{3}$
$\frac{7}{12}$
2.1
$\frac{2}{21}$
10
24
$\frac{5}{36}$
?$=\frac {1}{7} ×\frac {1}{7}+7 ×7$?
?$=\frac {1}{49}+49$?
?$=49 \frac {1}{49}$?
?$=\frac {4}{25} \div (\frac {11}{15} ×\frac {9}{11})$?
?$=\frac {4}{25} \div \frac {3}{5}$?
?$=\frac {4}{15}$?
?$=(\frac {1}{2}+\frac {2}{3}-\frac {5}{18}) ×36$?
?$=\frac {1}{2} ×36+\frac {2}{3} ×36-\frac {5}{18} ×36$?
?$=18+24-10$?
?$=32$?
?$=15 ×\frac {9}{8}+15 ×\frac {7}{8}$?
?$=15 ×(\frac {9}{8}+\frac {7}{8})$?
?$=15 ×2$?
?$=30$?
$\begin {aligned}解：x&=\frac {3}{14}×\frac {7}{12}\\x &=\frac {1}{8}\end {aligned}$
$\begin {aligned}解：\frac {1}{2}x&=2\\x &=4\end {aligned}$
$\begin {aligned}解：\frac {5}{7}x&=\frac {7}{8}×\frac {5}{14}\\\frac {5}{7}x&=\frac {5}{16}\\x &=\frac {7}{16}\end {aligned}$
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