Во втором при х=1,1решите оба примера ! - вопрос №999738411 от DemonDem25 22.01.2020 00:53

Question

Алгебра: Во втором при х=1,1решите оба примера !

DemonDem25 · Answer

[tex]1)b-rac{b^{3}-24b-5}{b^{2} -25}=rac{b^{3}-25b-b^{3}+24b+5}{b^{2}-25}=rac{5-b}{(b-5)(b+5)}=-rac{1}{b+5}=-rac{1}{-5,5}=1: rac{11}{2}=1*rac{2}{11}=rac{2}{11}: oxed{rac{2}{11}}[/tex][tex]2)rac{2x^{2}+7x+9}{x^{3}-1}+rac{4x+3}{x^{2}+x+1}-rac{5}{x-1}=rac{2x^{2}+7x+9}{(x-1)(x^{2}+x+1)}+rac{4x+3}{x^{2}+x+1}-rac{5}{x-1}=rac{2x^{2}+7x+9+4x^{2}-4x+3x-3-5x^{2}-5x-5}{(x-1)(x^{2}+x+1)}=rac{x^{2}+x+1}{(x-1)(x^{2}+x+1)}=rac{1}{x-1}=rac{1}{1,1-1}=rac{1}{0,1}=: oxed{10}[/tex]...