Răspuns:
Explicație pas cu pas:
e) An - An+1 = (n+1)/3^n - (n+2)/3^(n+1) =
1/3^n( n+1 - (n+2)/3) = (2n+1)/3^(n+1) > 0
An - An+1 >0, An > An+1 descrescator
f) An+1 - An = √(n+3) + √(n+1) - √(n+2) - √n > 0
pt. ca √(n+3) >√(n+2) si √(n+1) > √n
An+1 - An > 0, An+1 > An crescator
