Question

Answer 1

c: Ta có: \(\left(2\sqrt{3}-\sqrt{7}\right)\left(2\sqrt{3}+\sqrt{7}\right)-\left(\sqrt{3}+\sqrt{2}\right)^2\)

\(=12-7-5-2\sqrt{6}\)

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

Answer 2

b: Ta có: \(\sqrt{\left(2\sqrt{15}-8\right)^2}+\left(\sqrt{3}+\sqrt{5}\right)^2\)

\(=8-2\sqrt{15}+8+2\sqrt{15}\)

=16