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第21页

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$\begin{aligned}解：1.25x&=0.6×1.5\\1.25x&=0.9\\x&=0.72\end{aligned}$

$\begin{aligned}解：6x&=\frac {5}{2}×\frac {1}{5}\\6x&=\frac {1}{2}\\x&=\frac {1}{12}\end{aligned}$

$\begin{aligned}解：27x&=54×32\\27x&=1728\\x&=64\end{aligned}$

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

$\begin{aligned}解：0.8x&=3.6×1.2\\0.8x&=4.32\\x&=5.4\end{aligned}$

$\begin{aligned}解：3.2x&=0.84×\frac {4}{5}\\3.2x&=0.84×0.8\\3.2x&=0.672\\x&=0.21\end{aligned}$

解：x：5.6=2.1:2.8

2.8x=5.6×2.1

x=4.2