Question

simplificar e efetuar
a) 10!
8!
b) 4 . 2 !

c) 6!

d) 5! - 4!

Answer 1

a) se for 10!/8! = 10.9.8!/8! = 10.9 = 90
b) 4 . 2.1 = 8
c) 6.5.4.3.2.1 = 720
5! - 4! = 5.4.3.2.1 - 4.3.2.1 = 120 - 24 = 96 

Answer 2

a) 10!/8! = 10 . 9 . 8!/8! = 10 . 9 = 90 

b) 4 . 2! = 4 . 2.1 = 4 . 2 = 8 

c) 6! = 6.5.4.3.2.1 = 30 . 12 . 2 = 30 . 24 = 720 

d) 5! - 4! = (5.4.3.2.1)-(4.3.2.1) = 120 - 24 = 96                            ok