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1 afla c.m.m.m.c al nr
16 si 48, 24 si 72 , 112 ,28 si 981,  72 ,108 si 180
64 si 72,, 180 si 847, 392 ,252 si 560 , 360 si 270
2.aflati c.m.m.d.c si c.m.m.m.c
417,945 1008 si 1260 3240 si 5400 9200, 34500,27600,4600
 3 afati nr a si b stiind ca:
18 si ab in paranteze drepte egal 90