bài 2
a) | 3x+2| =\(\dfrac{4}{3}\)
3x+2 = \(\dfrac{4}{3}\)
3x = \(\dfrac{4}{3}\)-2
3x = \(\dfrac{-2}{3}\)
x = \(\dfrac{-2}{3}\):3
x= \(\dfrac{-2}{3}\). \(\dfrac{1}{3}\)
x = \(\dfrac{-2}{9}\)
vậy x = \(\dfrac{-2}{9}\)
b) | 2x- \(\dfrac{1}{3}\)| - \(\dfrac{1}{3}\)= \(\dfrac{-1}{5}\)
2x -\(\dfrac{1}{3}\)-\(\dfrac{1}{3}\)= \(\dfrac{-1}{5}\)
2x =\(\dfrac{-1}{5}\)+\(\dfrac{1}{3}\)+\(\dfrac{1}{3}\)
2x = \(\dfrac{7}{15}\)
x = \(\dfrac{7}{15}\): 2
x = \(\dfrac{7}{15}\).\(\dfrac{1}{2}\)
x= \(\dfrac{7}{30}\)
vậy x = \(\dfrac{7}{30}\)
c) | 4x +\(\dfrac{2}{7}\)| = | \(\dfrac{-5}{7}\)|
4x +\(\dfrac{2}{7}\)= \(\dfrac{-5}{7}\)
4x = \(\dfrac{-5}{7}\)-\(\dfrac{2}{7}\)
4x = \(\dfrac{-7}{7}\)
4x = -1
x= \(\dfrac{-1}{4}\)
x= -0,25
vậy x = - 0,25
