Răspuns:
[tex]55 = 5 \times 11 \\ 66 = 2 \times 3 \times 11 \\ 120 = {2}^{3} \times 3 \times 5 \\ 180 = {2}^{2} \times {3}^{2} \times 5 \\ 70 = 2 \times 5 \times 7 \\ 140 = 2^{2} \times 5 \times 7 \\ 210 = 2 \times 3 \times 5 \times 7[/tex]
cmmdc = 1