Question

Tìm x, biết

1.\(\left|-5x\right|=\frac{5}{3}\)            2. \(\left|3x\right|=\frac{1}{3}-\frac{1}{4}\)

3. \(\left|2x\right|=\frac{1}{4}\)                4. \(\left|2x-1\right|=\frac{1}{4}\)

 

 

Answer 1

 1.I-5xI =\(\frac{5}{3}\)\(\Leftrightarrow\)5x = \(\frac{5}{3}\)\(\Rightarrow\)x = \(\frac{1}{3}\)

                       5x =- \(\frac{5}{3}\)\(\Rightarrow\)x =- \(\frac{1}{3}\)

2. I3xI = \(\frac{1}{3}-\frac{1}{4}\)\(\Leftrightarrow\)3x = \(\frac{1}{3}-\frac{1}{4}\)\(\Rightarrow\)x = \(\frac{1}{36}\)

                                3x = \(-\left(\frac{1}{3}-\frac{1}{4}\right)\)\(\Rightarrow\)x = \(-\frac{1}{36}\)

3. I2xI = \(\frac{1}{4}\)\(\Leftrightarrow\)2x = \(\frac{1}{4}\)\(\Rightarrow\)x =  \(\frac{1}{8}\)

                       2x = \(-\frac{1}{4}\)\(\Rightarrow\)x =  \(-\frac{1}{8}\)

4. I2x-1I = \(\frac{1}{4}\)\(\Leftrightarrow\)2x-1 = \(\frac{1}{4}\)\(\Rightarrow\)x = \(\frac{5}{8}\)

                          2x-1 = \(-\frac{1}{4}\)\(\Rightarrow\)x = \(\frac{3}{8}\)