Ответ:
\[ (\sqrt{3}-2\sqrt{10})(\sqrt{3}+2\sqrt{10})=(\sqrt{3})^2-(2\sqrt{10})^2. \]
\[ (2\sqrt{10})^2=4\cdot10=40. \]
\[ 3-40=-37. \]
Ответ: \(-37\).
\[ (\sqrt{3}-2\sqrt{10})(\sqrt{3}+2\sqrt{10})=(\sqrt{3})^2-(2\sqrt{10})^2. \]
\[ (2\sqrt{10})^2=4\cdot10=40. \]
\[ 3-40=-37. \]
Ответ: \(-37\).