20) √6 + √750 − √600 =

\(\sqrt{750}=5\sqrt{30}\), а \(\sqrt{600}=10\sqrt{6}\).

\(\sqrt{6}+5\sqrt{30}-10\sqrt{6}=5\sqrt{30}-9\sqrt{6}\).

Ответ: \(5\sqrt{30}-9\sqrt{6}\).