Question

Решите номер 113.Есть вложение.

Answer 1

$( frac{a}{c} + frac{c}{a} -2)cdot frac{1}{a-c} = ( frac{a^2}{ac} + frac{c^2}{ac} - frac{2ac}{ac} )cdot frac{1}{a-c} = frac{a^2+c^2-2ac}{ac} cdot frac{1}{a-c} = \ = frac{(a-c)^2}{ac} cdot frac{1}{a-c} = frac{(a-c)^2}{ac(a-c)} =frac{a-c}{ac}$