Răspuns:
100:a=C₁ rest 10=> aC₁= 100-10 = 90
150:a=C₂ rest 15=>aC₂=150-15=135
250:a=C₃ rest 25=>aC₃=250-25=225
90 = 2·5·3²
135=3³·5
225 = 3²·5²
--------------------------
3²·5 = 9·5 = 45
verificare:
100 : 45 = 2 rest 10
150 : 45 = 3 rest 15
250 : 45 = 5 rest 25
