Question

Tìm x, bik

a, /x+\(2\frac{1}{3}\) / = 5\(\frac{2}{3}\) 

b//3x -2/ +4x = 9

Answer 1

a) \(\Rightarrow\left[\begin{array}{nghiempt}x+2\frac{1}{3}=5\frac{2}{3}\\x+2\frac{1}{3}=-5\frac{2}{3}\end{array}\right.\)  \(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{10}{3}\\x=-8\end{array}\right.\)

b) \(\Rightarrow\left[\begin{array}{nghiempt}\left(3x-2\right)+4x=9\\-\left(3x-2\right)+4x=9\end{array}\right.\) \(\Rightarrow\left[\begin{array}{nghiempt}7x-2=9\\x+2=9\end{array}\right.\) \(\Rightarrow\left[\begin{array}{nghiempt}7x=11\\x=7\end{array}\right.\) \(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{11}{7}\\x=7\end{array}\right.\)