第14页

信息发布者：
B
A
A
C
B
D
=2:3
=1:6
=11:8
=8:5
$\begin{aligned}解：\frac {1}{12}x&=\frac {3}{4}×\frac {1}{15}\\\frac {1}{12}x&=\frac {1}{20}\\x&=\frac {3}{5}\end{aligned}$
$\begin{aligned}解：0.3x&=42×0.45\\0.3x&=18.9\\x&=63\end{aligned}$
$\begin{aligned}解：\frac {7}{10}x&=\frac {3}{10}×\frac {2}{3}\\\frac {7}{10}x&=\frac {1}{5}\\x&=\frac {2}{7}\end{aligned}$
$\begin{aligned}解：14x&=0.7×5\\14x&=3.5\\x&=0.25\end{aligned}$
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