`text{Bài 24}`
\(\left\{ \begin{array}{l}3 - x ≥ 0\\x + 1 ≥ 0\end{array} \right.\)
`->` \(\left\{ \begin{array}{l}x ≤ 3\\x ≥ -1\end{array} \right.\)
`-> x in [-1; 3]`
`text{Bài 25}`
\(\left\{ \begin{array}{l}x + 3 < 4 + 2x\\5x - 3 < 4x - 1\end{array} \right.\)
`->` \(\left\{ \begin{array}{l}x > -1\\x < 2\end{array} \right.\)
`-> x in (-1; 2)`
`text{Bài 26}`
`|2x + 1| < x + 1`
`->` \(\left[ \begin{array}{l}2x + 1 < x + 1\\2x + 1 < -x - 1\end{array} \right.\)
`->` \(\left[ \begin{array}{l}x < 0\\x < -\dfrac{2}{3}\end{array} \right.\)
`-> x in (-infty; -2/3)`
`text{Bài 27}`
\(\left[ \begin{array}{l}2x - 1 > x - 2\\2x - 1 > 2 - x \end{array} \right.\)
`->` \(\left[ \begin{array}{l}x > -1\\x > 1\end{array} \right.\)
`-> x in (1; +infty)`
