daca avem o impartire
8:2=4
este clar ca
8= 2 x4
8=8
_____________________________________
cand avem rest la impartire, impartirea nu este exacta
avem o formula
a : b = c +rest
a = b x c +rest
______________________________________
637 : 3 = 212 rest 1
6
----
= 3
3
------
= 7
6
-----
1
637 : 3 = 212 rest 1
aplic formula pt verificare
a = b x c +rest
637 = 3 x 212 + 1
637 = 637
