Question

Решите пожалуйста Б и Г очень прошу !!!!!!!!

Answer 1

б)
$( frac{c+3}{c-3}- frac{c}{c+3} )* frac{c-3}{c+1}= frac{(c+3)^2-c(c-3)}{(c-3)(c+3)}* frac{c-3}{c+1}= \ \ = frac{c^2+6c+9-c^2+3c}{c+3}* frac{1}{c+1}= frac{9c+9}{c+3}* frac{1}{c+1}= \ \ = frac{9(c+1)}{c+3}* frac{1}{c+1}= frac{9}{c+3}$

г)
$(frac{a}{a-4}- frac{a-4}{a+4} )* frac{a+4}{4}= frac{a(a+4)-(a-4)^2}{(a-4)(a+4)}* frac{a+4}{4}= \ \ = frac{a^2+4a-a^2+8a-16}{a-4}* frac{1}{4}= frac{12a-16}{a-4}* frac{1}{4}= \ \ = frac{4(3a-4)}{a-4} * frac{1}{4}= frac{3a-4}{a-4}$