Question

Help tui zới

Answer 1

Answer 2

\(=\dfrac{\sqrt{7}\left(\sqrt{5}-1\right)}{\sqrt{5}-1}+\dfrac{12\left(\sqrt{7}+1\right)}{\left(\sqrt{7}+1\right)\left(\sqrt{7}-1\right)}\)

\(=\sqrt{7}+\dfrac{12\left(\sqrt{7}+1\right)}{7-1}=\sqrt{7}+2\left(\sqrt{7}+1\right)\)

\(=3\sqrt{7}+2\)