Question

СРОЧНО ДАЮ 25 БАЛЛОВ

Answer 1

Пояснення:

$\displaystyle\\(n-\frac{5n-36}{n-7} ):(2n+\frac{2n}{n-7})=\frac{n*(n-7)-1*(5n-36)}{n-7} :\frac{2n*(n-7)+1*2n}{n-7} =\\\\=\frac{n^2-7n-5n+36}{n-7}:\frac{2n^2-14n+2n}{n-7}=\frac{n^2-12n+36}{n-7}:\frac{2n^2-12n}{n-7}=\\\\ =\frac{n^2-2*n*6+6^2}{n-7} :\frac{2n*(n-6)}{n-7}=\frac{(n-6)^2}{n-7}:\frac{2n*(n-6)}{n-7}=\\\\ =\frac{(n-6)^2*(n-7)}{(n-7)*2n*(n-6)}=\frac{n-6}{2n} .$