239. Приведите к наименьшему общему знаменателю дроби: 1) 1/4 и 1/6; 2) 4/9 и 7/12; 3) 5/6 и 7/18; 4) 3/8 и 4/15; 5) 2/15 и 11/12; 6) 1/12 и 1/18; 7) 1/24 и 1/18; 8) 3/10, 3/8 и 3/4.

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НОЗ(4, 6) = 12: \(\frac{1}{4}=\frac{3}{12}\), \(\frac{1}{6}=\frac{2}{12}\). Ответ: \(\frac{3}{12}\) и \(\frac{2}{12}\).
НОЗ(9, 12) = 36: \(\frac{4}{9}=\frac{16}{36}\), \(\frac{7}{12}=\frac{21}{36}\). Ответ: \(\frac{16}{36}\) и \(\frac{21}{36}\).
НОЗ(6, 18) = 18: \(\frac{5}{6}=\frac{15}{18}\), \(\frac{7}{18}=\frac{7}{18}\). Ответ: \(\frac{15}{18}\) и \(\frac{7}{18}\).
НОЗ(8, 15) = 120: \(\frac{3}{8}=\frac{45}{120}\), \(\frac{4}{15}=\frac{32}{120}\). Ответ: \(\frac{45}{120}\) и \(\frac{32}{120}\).
НОЗ(15, 12) = 60: \(\frac{2}{15}=\frac{8}{60}\), \(\frac{11}{12}=\frac{55}{60}\). Ответ: \(\frac{8}{60}\) и \(\frac{55}{60}\).
НОЗ(12, 18) = 36: \(\frac{1}{12}=\frac{3}{36}\), \(\frac{1}{18}=\frac{2}{36}\). Ответ: \(\frac{3}{36}\) и \(\frac{2}{36}\).
НОЗ(24, 18) = 72: \(\frac{1}{24}=\frac{3}{72}\), \(\frac{1}{18}=\frac{4}{72}\). Ответ: \(\frac{3}{72}\) и \(\frac{4}{72}\).
НОЗ(10, 8, 4) = 40: \(\frac{3}{10}=\frac{12}{40}\), \(\frac{3}{8}=\frac{15}{40}\), \(\frac{3}{4}=\frac{30}{40}\). Ответ: \(\frac{12}{40}\), \(\frac{15}{40}\) и \(\frac{30}{40}\).

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