Răspuns :
(525,420)=21
525|5 420|2x5
105|5 42|2
21|3 21|3
7|7 7|7
1| 1|
525=3x5^2x7
420=2^2x3x7
C.m.m.d.c=3x7=21
525|5 420|2x5
105|5 42|2
21|3 21|3
7|7 7|7
1| 1|
525=3x5^2x7
420=2^2x3x7
C.m.m.d.c=3x7=21