Bài 2:
\(a,\Rightarrow\left|\dfrac{3}{4}+x\right|=1\Leftrightarrow\left[{}\begin{matrix}\dfrac{3}{4}+x=1\\\dfrac{3}{4}+x=-1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{1}{4}\\x=-\dfrac{7}{4}\end{matrix}\right.\\ b,\Leftrightarrow x+\dfrac{2}{5}=\dfrac{4}{9}:\dfrac{4}{9}=1\Leftrightarrow x=\dfrac{3}{5}\)
b: \(\dfrac{4}{9}:\left(x+\dfrac{2}{5}\right)=\dfrac{4}{9}\)
\(\Leftrightarrow x+\dfrac{2}{5}=1\)
hay \(x=\dfrac{3}{5}\)
a/ \(\left|\dfrac{3}{4}+x\right|=6-5=1\)
=> \(\left[{}\begin{matrix}\dfrac{3}{4}+x=1\\\dfrac{3}{4}+x=-1\end{matrix}\right.\left[{}\begin{matrix}x=\dfrac{1}{4}\\x=\dfrac{-7}{4}\end{matrix}\right.\)
b/\(\dfrac{4}{9}:\left(x+0,4\right)=\dfrac{4}{9}\)
=>\(x+0,4=1\)
=> \(x=0,6\)