Câu trả lời:
a) \(2\sqrt{75}-4\sqrt{12}-3\sqrt{50}-\sqrt{72}\)
= \(2.5\sqrt{3}-4.2\sqrt{3}-3.5\sqrt{2}-6\sqrt{2}\)
= \(10\sqrt{3}-8\sqrt{3}-15\sqrt{2}-6\sqrt{2}\)
= \(\sqrt{3}\left(10-8\right)-\sqrt{2}\left(15+6\right)\)
= \(2\sqrt{3}-21\sqrt{2}\)