Question

rút gọn biểu thức

a)(\(\sqrt{10}+\sqrt{2}\))\(\left(6-2\sqrt{5}\right)\sqrt{3+\sqrt{5}}\)

Answer 1

\(=\left(6-2\sqrt{5}\right)\cdot\left(\sqrt{5}+1\right)\cdot\sqrt{6+2\sqrt{5}}\)

\(=\left(6-2\sqrt{5}\right)\left(6+2\sqrt{5}\right)\)

=36-20

=16