Question

 giúp mik câu b và c 

Answer 1

b) \(\Rightarrow\dfrac{3}{2}-11x=\dfrac{2}{5}\Rightarrow11x=\dfrac{3}{2}-\dfrac{2}{5}=\dfrac{11}{10}\Rightarrow x=\dfrac{1}{10}\)

c) ĐKXĐ: \(x\ne-\dfrac{1}{3}\)

\(\Rightarrow\left(3x+1\right)^2=16\Rightarrow\left[{}\begin{matrix}3x+1=4\\3x+1=-4\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=1\left(tm\right)\\x=-\dfrac{5}{3}\left(tm\right)\end{matrix}\right.\)

Answer 2

b) \(\dfrac{3}{2}-11x=\left|-\dfrac{2}{5}\right|\)

\(\Rightarrow\dfrac{3}{2}-11x=\dfrac{2}{5}\)

\(\Rightarrow11x=\dfrac{11}{10}\)

\(\Rightarrow x=\dfrac{1}{10}\)

c) \(\dfrac{3x+1}{2}=\dfrac{8}{3x+1}\)

\(\Rightarrow\left(3x+1\right)^2=8.2\)

\(\Rightarrow\left(3x+1\right)^2=16\)

\(\Rightarrow\left[{}\begin{matrix}3x+1=4\\3x+1=-4\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=1\\x=\dfrac{-5}{3}\end{matrix}\right.\)