Bài 1:
\(\left\{ \begin{array}{l}m + 5 > -2\\m < 3\end{array} \right.\)
`<=>` \(\left\{ \begin{array}{l}m > -7\\m < 3\end{array} \right.\)
`=> -7 < m < 3`
`=>` Chọn `C`
Bài 2:
\(\left\{ \begin{array}{l}3 - x ≥ 0\\x + 1 ≥ 0\\(x - 3)(x - 2) \ne 0\end{array} \right.\)
`<=>` \(\left\{ \begin{array}{l}x ≤ 3\\x ≥ -1\\x \ne 3\\x \ne 2\end{array} \right.\)
`=> D = [-1; 3) \\ {2}`
`=>` Chọn `A`
Bài 3:
`x - m + 1 \ne 0`
`<=> x \ne m - 1`
`=>` \(\left[ \begin{array}{l}m - 1 ≤ 0\\m - 1 ≥ 2\end{array} \right.\)
`<=>` \(\left[ \begin{array}{l}m ≤ 1\\m ≥ 3\end{array} \right.\)
`=>` Chọn `D`
