Đáp án:
$\begin{array}{l}
15)\\
A = \left[ {m;m + 2} \right];B = \left[ { - 1;2} \right]\\
A \subset B\\
\Rightarrow \left[ {m;m + 2} \right] \subset \left[ { - 1;2} \right]\\
\Rightarrow - 1 \le m < m + 2 \le 2\\
\Rightarrow \left\{ \begin{array}{l}
m \ge - 1\\
m \le 0
\end{array} \right.\\
\Rightarrow - 1 \le m \le 0\\
\Rightarrow B\\
16)\\
A = \left[ { - 2;3} \right];B = \left( {m;m + 6} \right)\\
A \subset B\\
\Rightarrow \left[ { - 2;3} \right] \subset \left( {m;m + 6} \right)\\
\Rightarrow - 2 < m < 3 < m + 6\\
\Rightarrow \left\{ \begin{array}{l}
- 2 < m < 3\\
m + 6 > 3
\end{array} \right.\\
\Rightarrow \left\{ \begin{array}{l}
- 2 < m < 3\\
m < - 3
\end{array} \right.\\
\Rightarrow - 2 < m < 3
\end{array}$
