Respostas

2014-02-24T23:18:41-03:00
A)8×7×6×5!÷5!×2!CORTA 5! COM 5!
336÷2=168
B)6×5!÷5! CORTA NOVAMENTE E
=6
2014-02-24T23:18:47-03:00
A) 8!.7!.6!.5!/5!=336
2!=4
336/4=84
b) 0!=1
2!=4, logo 0!/2!=1/4;
6!/5!=1, então, 0!/2!+6!/5!= 1/4+1=5/4