Question

Вычисления с корнем...

Answer 1

$sqrt{x^2}=|x|= left { {{x,; esli; x geq 0,} atop {-x,; esli; x textless 0.}} right. ; ; ; to \\\sqrt{(5-sqrt{13})^2}+sqrt{(3-sqrt{13})^2} =|underbrace {5-sqrt{13}}_{ textgreater 0}|+|underbrace {3-sqrt{13}}_{ textless 0}|=\\=5-sqrt{13}+(sqrt{13}-3)=2$