Question

Помогите решить последний номер!

Answer 1

$tt 8) cfrac{a}{sqrt{10}}=cfrac{acdotsqrt{10}}{sqrt{10}cdotsqrt{10}}=cfrac{asqrt{10}}{10}\\\ 9) cfrac{6}{5sqrt{7}}=cfrac{6cdotsqrt{7}}{5sqrt{7}cdotsqrt{7}}=cfrac{6sqrt{7}}{5cdot7}=cfrac{6sqrt{7}}{35}\\\ 11) cfrac{7}{8+3sqrt{7}}=cfrac{7(8-3sqrt{7})}{(8+3sqrt{7})(8-3sqrt{7})}=cfrac{56-21sqrt{7}}{64-63}=56-21sqrt{7}$

Answer 2

Через Photomatch сделал?