Question

помогите пж!!! срочно надо

Answer 1

1)frac{8c}{c^{2}-b^{2}}+ frac{8}{b-c}= frac{8c}{(c-b)(c+b)}- frac{8}{c-b}= frac{8c-8c-8b}{(c-b)(c+b)}=- frac{8}{(c-b)(c+b)}= frac{8}{(b-c)(b+c)}= frac{8}{b^{2}-c^{2}}\\frac{8}{(-2)^{2}-(-3)^{2}}= frac{8}{4-9}=- frac{8}{5}=-1,6\\2)frac{1}{t+p}+ frac{3tp}{t^{3}+p^{3}}= frac{1}{t+p}+ frac{3tp}{(t+p)(t^{2}-tp+p^{2})}= frac{t^{2}-tp+p^{2}+3tp}{(t+p)(t^{2}-tp+p^{2})}= frac{t^{2}+2tp+p^{2}}{(t+p)(t^{2}-tp+p^{2})}= frac{(t+p)^{2}} {(t+p)(t^{2}-tp+p^{2})}=frac{t+p}{t^{2}-tp+p^{2}}