Question

làm từ câu 39 đến 53 ạ milk cần gấp ạ cảm ơn

Answer 1

39) Ta có: \(\sqrt{49-5\sqrt{96}}-\sqrt{49+5\sqrt{96}}\)

\(=\sqrt{49-20\sqrt{6}}-\sqrt{49+20\sqrt{6}}\)

\(=5-2\sqrt{6}-5-2\sqrt{6}\)

\(=-4\sqrt{6}\)

40) Ta có: \(\sqrt{35+12\sqrt{6}}-\sqrt{35-12\sqrt{6}}\)

\(=3\sqrt{3}+2\sqrt{2}-3\sqrt{3}+2\sqrt{2}\)

\(=4\sqrt{2}\)

41) Ta có: \(\sqrt{13+2\sqrt{42}}+\sqrt{13-2\sqrt{42}}\)

\(=\sqrt{7}+\sqrt{6}+\sqrt{7}-\sqrt{6}\)

\(=2\sqrt{7}\)