21/08/14
Pág.
140 – Exercícios 34 e 35
34) Simplifique:
a) (n+1)! ->
(n+1).n.(n-1)! -> (n+1).n
(n-1)! (n-1)!
b) (n+2)! ->
(n+2)(n+1).n! -> (n+2)(n+1)
n! n!
35) Efetue:
a) 1 -
1 -> m.m.c=(n+1)! -> (n+1)! -> (n+1).n!
-> (n+1)
n! (n+1)! n! n!
-> (n+1)n!
b) (n+1)!-n! -> n![(n+1) -1]
-> n!.n -> n(n-1)!n -> n2
n! - (n-1)!
(n-1)!(n-1) (n-1)!(n-1) (n-1)! n-1 n-1
-> n(n-1)!
- Resolva a equação:
n! +(n+1)!=6n-4(n-2)! (n-1)!