Question

Answer 1

\(a,\left(2\sqrt{5}+2\sqrt{3}\right)^2-4\sqrt{60}=20+8\sqrt{15}+12-8\sqrt{15}=32\)

b, Để 2 đường thẳng song song thì \(\left\{{}\begin{matrix}m^2=4\\-2\ne m\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}m=\pm2\\m\ne-2\end{matrix}\right.\Leftrightarrow m=2\)

Answer 2