Question

Решите пожалуйста,и распишите

Answer 1

$frac{7 + sqrt{7} }{3 sqrt{7} } = frac{(7 + sqrt{7}) times 3 sqrt{7} }{3 sqrt{7} times 3 sqrt{7} } = frac{21 sqrt{7} + 21 }{63} = \ = frac{ sqrt{7} }{3} + frac{1}{3} = frac{ sqrt{7} + 1 }{3} \ frac{c {}^{2} - 2}{c - sqrt{2} } = frac{c {}^{2} - (sqrt{2} {)}^{2} }{c - sqrt{2} } = frac{(c - sqrt{2})(c + sqrt{2} ) }{c - sqrt{2} } = \ = c + sqrt{2}$