Question

Simplifique as expressões a) 7!
___
9!
B) 6! + 5!
______
5!

Answer 1

A)

$\frac{7!}{9!}= \frac{7!}{9*8*7!}= \frac{1}{9*8}= \frac{1}{72}$

B) 

$\frac{6!+5!}{5!}= \frac{(6*5!)+5!}{5!} = \frac{5!(6+1)}{5!}= \frac{6+1}{1}= 6+1 = 7$