Question

Прошу помочь с Д/З по математике. (дроби)
№ 269,271,272,275

Answer 1

$\frac{3}{x+2} - \frac{3}{x-2} = \frac{3x-6-3x-6}{(x-2) (x+2} = \frac{-12}{ x^{2} -4}$
$\frac{y-2}{y^2-y} + \frac{1}{y-1} = \frac{y-2+y}{y(y-1)}= \frac{2y+2}{y(y-1)}$

$\frac{1}{c+2} + \frac{4+c}{c(c+2)} = \frac{c+4+c}{c(c+2)} = \frac{2c+4}{c(c+2)} = \frac{2(c+2)}{c(c+2)} = \frac{2}{c}$
$\frac{m+15}{(m+5)(m-5)} + \frac{1}{m+5} = \frac{m+15+m-5}{(m+5)(m-5)}= \frac{2m+10}{(m+5)(m-5)} = \frac{2}{m-5}$