simplifique as expressões a) (n+4)!/(n+2)! + (n+3)! b)(n-1)! +n!/(n+1)! Ajuda ai por favor!!!

[latex]\frac{(n+4)!}{(n+2)!}+(n+3)!=\frac{(n+2)!.(n+3).(n+4)}{(n+2)!}+(n+3)!=\\ =(n+3).(n+4)+(n+3)![/latex] [latex](n-1)!+\frac{n!}{(n+1)!}=(n-1)!+\frac{n!}{n!.(n+1)}=(n-1)!+\frac1{n+1}[/latex]