Question

помогите решить две задачи

Answer 1

1) 2n-1/n+4+ 8-6n-2n^2/(n+4)^2=
(2n-1)(n+4)+8-6n-2n^2/(n+4)^2=
2n^2+8n-n-4+8-6n-2n^2/(n+4)^2=
n+4/(n+4)^2=1/n+4