1)$\Leftrightarrow \left\{ \begin{array}{l} 2x-1\geq 0\\ \frac{x+1}{2-x} \geq 0\\2x-1\leq \frac{2x^2+4x+2}{4-4x+x^2}\end{array} \right.$$\Leftrightarrow \left\{ \begin{array}{l} x\geq -1/2\\ -1\leq x\leq 2\\2x^3-14x^2-4x\leq 0\end{array} \right.$$\Leftrightarrow \left\{ \begin{array}{l} -1/2\leq x\leq 2 \\ x(2x^2-14x-4)\leq 0\end{array} \right.$nhok xử tiếp jum chị nha T_T
1)$\Leftrightarrow \left\{ \begin{array}{l} 2x
+1\geq 0\\ \frac{x+1}{2-x} \geq 0\\2x
+1\leq \frac{
4(x^2+
2x+
1)}{4-4x+x^2}\end{array} \right.$$\Leftrightarrow \left\{ \begin{array}{l} x\geq -
\dfrac{1
}{2
}\\ -1\leq x
&l
t; 2\\2x^3-1
1x^2-4x\leq 0\end{array} \right.$$\Leftrightarrow \left\{ \begin{array}{l} -
\dfrac{1
}{2
}\leq x
&l
t;2 \\ x(2x^2-1
1x-4)\leq 0\end{array} \right.$
$\Leftrigh
tarro
w \left\{ \begin{array}{l} -\dfrac{1}{2}\leq x
< 2 \\ \left
[ \begin{m
atrix} 0\le x<2 \\ 2<x \le \dfrac
{1}{4}(11+3\sqrt{17}) \\ x\le \dfrac{1}{4}(11-3\sqrt{17}) \end{matrix} \righ
t. \en
d{array} \righ
t.$$\Leftrighta
rrow \left [ \begin{matrix} 0\le x<2 \\ -\dfrac{1}{2} \le x\le \dfrac{1}{4}(11-3\sqrt{17}) \end{matrix} \right. $