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$\frac{14}{21} = \frac{2}{3}; \\ \frac{6}{9} = \frac{2}{3}; \\ \frac{88}{99} = \frac{8}{9}. \\ \\ \frac{8 \times 11}{33 \times 4} = \frac{2 }{3}; \\ \frac{18 \times 25}{75 \times 12} = \frac{3}{2} = 1 \frac{1}{2}; \\ \frac{6 \times 7 + 5 \times 7}{49} = \frac{6 + 5}{7} = \frac{11}{7}. \\ \\ \frac{504}{1260} = \frac{2 \times 252}{5 \times 252} = \frac{2}{5},$
НОД(504, 1260) = 252.

НОД(102, 510) = 10,
НОК(102, 510) = (102 × 510) / 10 = 5202.

НОД(600, 140) = 50,
НОК(600, 140) = (600 × 140) / 50 = 1680.