Question

$\frac{5!}{2!+3!} \frac{12!3!}{15!}$

Answer 1

$Resolu\c{c}\~ao \to \left\{\begin{array}{ccc}\frac{5!}{2!+3!} = \frac{5*4*3*2!}{2!+3*2!} = \frac{5*4*3*2!}{2!(1+3)} = \frac{60}{4} = 15\\\\\frac{12!*3!}{15!} = \frac{12!*3!}{15*14*13*12!} = \frac{3!}{15*14*13} = \frac{6}{2730} = \frac{1}{455} \end{array}\right$

Espero ter ajudado. =^.^=

Answer 2

 

a)  5.4.3.2!  =    60.2!    =   60 ==> 15
     2!+3.2!       2!(1+3)        4
  
b)       12!3.2.1   =         6       =    1   
     15.14.13.12!       15.14.13      455