Question

Giúp mik trc ngày mai ạ

Answer 1

1: Ta có: \(\sqrt{5-2\sqrt{6}}+\sqrt{5+2\sqrt{6}}\)

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

\(=2\sqrt{3}\)

2: Ta có: \(\sqrt{7-2\sqrt{10}}-\sqrt{7+2\sqrt{10}}\)

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

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

3: Ta có: \(\sqrt{7+2\sqrt{6}}-\sqrt{7-2\sqrt{6}}\)

\(=\sqrt{6}+1-\sqrt{6}+1\)

=2

4: Ta có: \(\sqrt{12-2\sqrt{11}}-\sqrt{12+2\sqrt{11}}\)

\(=\sqrt{11}-1-\sqrt{11}-1\)

=-2