Question

rezolvati : (n+3)! supra (n+1)! egal 20

Answer 1

(n+3)/(n+1)=20
(n+3)/(n+1)-(20)=0
(n+3)/n+1-20=0
20=20/1=20*(n+1) totul/(n+1)
(n+3)-(20*(n+1)totul/1*(n+1)=-19n-17totul/1*(n+1)
-19n-17=-1*(19n+17)
-19n-17 supra n+1=0
-19-17 supra (n+1) *n+1=0*n+1
-19-17=0
-19n=17
n=-17/19
n=0,895