Question

Simplifique a expressão: 12!/10!+9! 

Answer 1

$\frac{12!}{10!+9!}\\\\ \frac{12!}{10*9!+9!}\\\\ \frac{12!}{9!(10+1)}\\\\ \frac{12!}{9!*11}\\\\ \frac{12*11*10*9!}{9!*11}\\\\ 12*10\\\\ 120\\\\ \boxed{5!}$