Question

Answer 1

a: =>|x-3|=3-x

=>x-3<=0

=>x<=3

b: =>|2x-5|=5-2x

=>2x-5<=0

=>x<=5/2

c: =>|6x-1|=5

=>6x-1=5 hoặc 6x-1=-5

=>x=1 hoặc x=-2/3

Answer 2

Lời giải:

a. PT $\Leftrightarrow |x-3|=3-x$

$\Leftrightarrow 3-x\geq 0$

$\Leftrightarrow x\leq 3$

b. PT $\Leftrightarrow \sqrt{(2x-5)^2}+2x=5$

$\Leftrightarrow |2x-5|=5-2x$

$\Leftrightarrow 5-2x\geq 0$

$\Leftrightarrow x\leq \frac{5}{2}$

c.

PT $\Leftrightarrow \sqrt{(6x-1)^2}=5$

$\Leftrightarrow |6x-1|=5$

$\Leftrightarrow 6x-1=\pm 5$

$\Leftrightarrow x=1$ hoặc $x=\frac{-2}{3}$