3n(n+1)-(3n-2)(n+1)
--------------------------
2(n+1)
3n/2 - (3n-2)/2
3n/2 - 3n/2 + 2/2 = 1
4n + 4 - 2n - 2
--------------------
2(n + 1)
4(n + 1) - 2(n + 1)
-----------------------
2(n + 1)
2 - 1 = 1
10n + 10
------------
5*2(n + 1)
10(n + 1)
----------- = 1
10(n + 1)
5(n + 1) - (n + 1)
---------------------
2*2(n + 1)
5/4 - 1/4 = 4/4 = 1
6(n - 1) - 4(n - 2)
----------------------
2(n + 1)
3(n - 1) - 2(n - 2)
----------------------
(n + 1)
Pas divisible
3(n + 1) - n + 1
--------------------
2(n + 1)
Pas divisible
2(n - 1) + 4
---------------
2(n + 1)
2(n - 1 + 2)
---------------
2(n + 1)
2(n + 1)
---------- = 1
2(n + 1)
3(n + 3) - n - 7
--------------------
2(n + 1)
3n + 9 - n - 7
-------------------
2(n + 1)
2n + 2
----------
2(n + 1)
2(n + 1)
----------- = 1
2(n + 1)