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第74页

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$\begin{aligned}解：\frac {3}{5}x&=\frac {5}{8}×\frac {2}{5}\\\frac {3}{5}x&=\frac {1}{4}\\x&=\frac {1}{4}×\frac {5}{3}\\x&=\frac {5}{12}\end{aligned}$

$\begin{aligned}解：\frac {9}{5}x&=\frac {27}{25}\\x&=\frac {27}{25}×\frac {5}{9}\\x&=\frac {3}{5}\end{aligned}$

$\begin{aligned}解：1.25x&=3.75\\x&=3.75÷1.25\\x&=3\end{aligned}$

$\begin{aligned}解：\frac {1}{4}x&=\frac {21}{8}\\x&=\frac {21}{8}×4\\x&=\frac {21}{2}\end{aligned}$

$\begin{aligned}解：3x&=9\\x&=9÷3\\x&=3\end{aligned}$

$\begin{aligned}解：18x&=36×13\\x&=36×13÷18\\x&=26\end{aligned}$

$\begin{aligned}解：4x&=16×1.8\\x&=16×1.8÷4\\x&=4×1.8\\x&=7.2\end{aligned}$

$\begin{aligned}解：18x&=180\\x&=180÷18\\x&=10\end{aligned}$

$\begin{aligned}解：3x&=\frac {3}{2}\\x&=\frac {3}{2}×\frac {1}{3}\\x&=\frac {1}{2}\end{aligned}$

$\begin{aligned}解：8x&=120\\x&=120÷8\\x&=15\end{aligned}$

$\begin{aligned}解：\frac {1}{4}x&=8\\x&=8÷\frac {1}{4}\\x&=32\end{aligned}$

$\begin{aligned}解：3x&=10\\x&=10÷3\\x&=\frac {10}{3}\end{aligned}$

$\begin{aligned}解：\frac {1}{3}x&=\frac {1}{9}\\x&=\frac {1}{9}×3\\x&=\frac {1}{3}\end{aligned}$

$\begin{aligned}解：51x&=11.9\\x&=11.9÷51\\x&=\frac {7}{30}\end{aligned}$

$\begin{aligned}解：\frac {14}{5}x&=21\\x&=21×\frac {5}{14}\\x&=\frac {15}{2}\end{aligned}$