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第50页

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

$\begin {aligned}解：\frac {3}{5}x&=\frac {1}{4}×\frac {2}{3}\\\frac {3}{5}x&=\frac {1}{6}\\x &=\frac {5}{18}\end {aligned}$

$\begin {aligned}解： \frac {3}{5}x&=\frac {7}{20}×4\\\frac {3}{5}x&=\frac {7}{5}\\x &=\frac {7}{3}\end {aligned}$

$\begin {aligned}解： \frac {15}{2}x&=2×\frac {5}{2}\\\frac {15}{2}x&=5\\x &=\frac {2}{3}\end {aligned}$

$\begin {aligned}解：0.36x &= 4.8×1.5\\0.36x&=7.2\\x &=20\end {aligned}$

$\begin {aligned}解：\frac {5}{6}x&=\frac {2}{3}×\frac {8}{9}\\\frac {5}{6}x&=\frac {16}{27}\\x &=\frac {32}{45}\end {aligned}$