Question

tìm x

 

a) |2x-1| =5

 

b) \(\left|x+\frac{3}{4}\right|=3\)

 

c) 0,2 - |4,2-2x| = 0

Answer 1

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

Vậy: \(x=3\) hoặc \(x=-3\)

Answer 2

b) \(\Rightarrow\left[\begin{array}{nghiempt}x+\frac{3}{4}=3\\x+\frac{3}{4}=-3\end{array}\right.\)\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{9}{4}\\x=-\frac{15}{4}\end{array}\right.\)

Vậy: \(x=\frac{9}{4}\) hoặc \(x=-\frac{15}{4}\)

Answer 3

c) \(\Rightarrow\left[\begin{array}{nghiempt}4,2-2x=0,2\\4,2-2x=-0,2\end{array}\right.\)\(\Rightarrow\left[\begin{array}{nghiempt}x=2\\x=\frac{11}{5}\end{array}\right.\)

Vậy: \(x=2\) hoặc \(x=\frac{11}{5}\)