Question

$\frac{13+\sqrt{69} }{13-\sqrt{69} } +\frac{13-\sqrt{69} }{13+\sqrt{69} }$

Answer 1

Ответ:

Объяснение:

$\frac{(13+\sqrt{69})^2+(13-\sqrt{69})^2 }{(13-\sqrt{69} )*(13-\sqrt{69} )} =$

$\frac{169+26\sqrt{69}+69+169-26\sqrt{69}+69  }{13^2-\sqrt{69}^2 } =$

=$\frac{169+69+169+69}{169-69} =\frac{476}{100} =4,76$