Question

afltinumerele naturale a,b stiind ca a*b=143, b*c=195, a*c=165

Answer 1

a*b=143         143=11*13           (1)
b*c=195         195=3*5*13          (2)
a*c=165         165=3*5*11          (3)
din  (1) si (3) ⇒a=11  
⇒b=143:11=13
⇒c=165:11=15