Question

gia tri tuyet doi cua 2x-1<hoac= 4

Answer 1

Ta có: \(\left|2x-1\right|\le4\)

\(\Rightarrow\left|2x-1\right|\in\left\{0;1;2;3;4\right\}\)

Lại có 2k-1 là số lẻ \(\Rightarrow\) \(\left[{}\begin{matrix}\left|2x-1\right|=1\\\left|2x-1\right|=3\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}2x-1=1\\2x-1=-1\\2x-1=3\\2x-1=-3\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=0\\x=2\\x=-1\end{matrix}\right.\)

Vậy:.................