3)
a) \(A=\left(m-2;m\right);B=\left(0;+\infty\right)\)
\(A\subset B\Rightarrow m-2>0\Leftrightarrow m>2\)
b) \(A=[m-1;m+2);B=\left(0;6\right)\)
\(A\subset B\Rightarrow\left\{{}\begin{matrix}m-1>0\\m+2< 6\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}m>1\\m< 4\end{matrix}\right.\) \(\Leftrightarrow1< m< 4\)
c) \(A=\left(-\infty;4\right);B=\left(-\infty;m+1\right)\)
\(A\subset B\Rightarrow m+1< 4\Leftrightarrow m< 3\)
d) \(A=[m;m+3);B=\left(-2;4\right)\)
\(A\subset B\Rightarrow\left\{{}\begin{matrix}m>-2\\m+3< 4\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}m>-2\\m< 1\end{matrix}\right.\) \(\Leftrightarrow-2< m< 1\)