Question

\(\left|3x-5\right|=4\)

Answer 1

\(\left|3x-5\right|=4\)

th1: \(3x-5\ge0\Leftrightarrow3x\ge5\Leftrightarrow x\ge\dfrac{5}{3}\)

\(\Rightarrow\left|3x-5\right|=4\Leftrightarrow3x-5=4\Leftrightarrow3x=4+5=9\Leftrightarrow x=\dfrac{9}{3}=3\left(tmđk\right)\)

th2: \(3x-5< 0\Leftrightarrow3x< 5\Leftrightarrow x< \dfrac{5}{3}\)

\(\Rightarrow\left|3x-5\right|=4\Leftrightarrow5-3x=4\Leftrightarrow3x=5-4=1\Leftrightarrow x=\dfrac{1}{3}\left(tmđk\right)\)

vậy \(x=3;x=\dfrac{1}{3}\)

Answer 2

|3x -5|=4

=> 3x-5 = -4

3x-5= 4

=> 3x=-4+5=1

3x= 4+5=9

=> x= 1/3

x=3

Answer 3

Bài này ko làm được thì nghỉ học đi