k: \(\Leftrightarrow\left|2x-4.2\right|=0.2\)
\(\Leftrightarrow\left[{}\begin{matrix}2x-4.2=-0.2\\2x-4.2=0.2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\\x=2.2\end{matrix}\right.\)
m: \(\Leftrightarrow6:x=\dfrac{2}{3}\cdot4=\dfrac{8}{3}\)
hay \(x=6:\dfrac{8}{3}=6\cdot\dfrac{3}{8}=\dfrac{18}{8}=\dfrac{9}{4}\)
n: \(\Leftrightarrow\dfrac{5}{3}:\dfrac{x}{4}=6\cdot\dfrac{10}{3}=20\)
\(\Leftrightarrow x\cdot\dfrac{1}{4}=\dfrac{5}{3}:20=\dfrac{5}{3}\cdot\dfrac{1}{20}=\dfrac{5}{60}=\dfrac{1}{12}\)
hay x=1/3
p: \(\Leftrightarrow\dfrac{8}{3}:x=\dfrac{16}{9}:\dfrac{8}{3}=\dfrac{16}{9}\cdot\dfrac{3}{8}=\dfrac{2}{3}\)
hay x=4
\(k,\Rightarrow\left[{}\begin{matrix}4,2-2x=0,2\\2x-4,2=0,2\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}2x=4\\2x=4,4\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=2\\x=2,2\end{matrix}\right.\\ m,\Rightarrow\dfrac{6}{x}=\dfrac{8}{3}\Rightarrow x=\dfrac{6\cdot3}{8}=\dfrac{9}{4}\\ n,\Rightarrow\dfrac{5}{3}:\dfrac{x}{4}=20\\ \Rightarrow\dfrac{x}{4}=\dfrac{5}{3}:20=\dfrac{1}{12}\Rightarrow x=\dfrac{4}{12}=\dfrac{1}{3}\\ p,\Rightarrow\dfrac{8}{3}:x=\dfrac{16}{9}:\dfrac{8}{3}=\dfrac{2}{3}\\ \Rightarrow x=\dfrac{8}{3}:\dfrac{2}{3}=4\)
