Сократите дробь : а) 7+√7/√56+√8 б) 400-8/20+√8

[latex]\frac{7+\sqrt{7}}{\sqrt{56}+\sqrt{8}}=\frac{\sqrt{7}(\sqrt{7}+1)}{\sqrt{8}(\sqrt{7}+1)}=\frac{\sqrt{7}}{\sqrt{8}}=\frac{\sqrt{7}}{2\sqrt{2}}=\frac{1}{2}\sqrt{3,5}\\\\\frac{400-8}{20+\sqrt{8}}=\frac{(20-\sqrt{8})(20+\sqrt{8})}{20+\sqrt{8}}=20-\sqrt{8}[/latex]