Verified answer

Veja:

[5m!-2.(m-1)!]/m! =

[5m.(m-1)!-2.(m-1)!]/m.(m-1)! =

(m-1)![5m.-2]/m.(m-1)! =

[5m.-2]/m.

[5m(m-1)! - 2(m-1)!]/m!

(m-1)!(5m - 2)/m!

(m-1)!(5m - 2)/[m.(m-1)!]

(5m - 2)/m

5 - 2/m

Veja:

[5m!-2.(m-1)!]/m! =

[5m.(m-1)!-2.(m-1)!]/m.(m-1)! =

(m-1)![5m.-2]/m.(m-1)! =

[5m.-2]/m.

[(5m!-2.(m-1)!]/m!

2.(m-1)!=(2*m!/m)

fica

[5m!-(2*m!/m)]/m!

(5m-2)/m