Question

Sáng mai em nộp Giúp em với

Answer 1

13.

\(A\cap B=\varnothing\Leftrightarrow\left[{}\begin{matrix}m-2\ge9\\m+5\le-4\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}m\ge11\\m\le-9\end{matrix}\right.\)

14.

\(X\cap Y=\varnothing\Leftrightarrow2a+3\ge6\)

\(\Leftrightarrow a\ge\dfrac{3}{2}\)