Question

Tìm x, biết :

|2x-5|=13

|5x-2| < hoặc = 13

nhanh nhé chiều nay nộp rồi !

Answer 1

\(|2x-5|=13\)

TH1: \(2x-5=13\)

\(2x=18\)

\(x=9\)

TH2: \(2x-5=-13\)

\(2x=-8\)

\(x=-4\)

Vậy: \(x\in\left\{-4;9\right\}\)

=.= hk tốt!!

Answer 2

\(\left|2x-5\right|=13\)

\(\Leftrightarrow\orbr{\begin{cases}2x-5=13\\2x-5=-13\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=9\\x=-4\end{cases}}\)

\(\left|5x-2\right|\le13\)

\(\Rightarrow x\in\left\{-1;0;1;2;3\right\}\)