Răspuns :
60 = 2^2 × 3 × 5
195 = 3 × 5 × 13
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cmmdc = 3 × 5 = 15
195 = 3 × 5 × 13
_____________
cmmdc = 3 × 5 = 15
60:2=30 ; 30:2=15 ; 15=3x5 ; 60 = 2x2x3x5 = 2²x3x5 ;
195:3=65 ; 65:5=13 : 195=3x5x13 ;
cmmdc = 3x5 = 15 ;