4. Вычислите

А) $(4/5 - 1/3) * 15 = (12/15 - 5/15) * 15 = 7/15 * 15 = 7$ Б) $(2/7 + 5/21) * 21 = (6/21 + 5/21) * 21 = 11/21 * 21 = 11$ В) $(7/12 - 5/9) * 12 = 7/12 * 12 - 5/9 * 12 = 7 - 20/3 = 7 - 6 \frac{2}{3} = \frac{1}{3}$ Г) $(3/8 + 5/12) * 24 = 3/8 * 24 + 5/12 * 24 = 9 + 10 = 19$ Д) $(8/11 - 3/22) * 44 = (16/22 - 3/22) * 44 = 13/22 * 44 = 13 * 2 = 26$ Е) $6 \frac{1}{5} * 4 = 31/5 * 4 = 124/5 = 24 \frac{4}{5} = 24,8$ Ё) $10 * 5 \frac{2}{5} = 10 * 27/5 = 2 * 27 = 54$ Ж) $12 \frac{9}{13} * 13 = 165/13 * 13 = 165$ З) $(4 \frac{2}{3} + 5 \frac{1}{2}) * 6 = (4 \frac{4}{6} + 5 \frac{3}{6}) * 6 = 9 \frac{7}{6} * 6 = 10 \frac{1}{6} * 6 = 61/6 * 6 = 61$ И) $(8 - 1 \frac{1}{9}) * 9 = 8 * 9 - 10/9 * 9 = 72 - 10 = 62$ Й) $(3 \frac{3}{5} - 2 \frac{1}{15}) * 5 = (3 \frac{9}{15} - 2 \frac{1}{15}) * 5 = 1 \frac{8}{15} * 5 = 23/15 * 5 = 23/3 = 7 \frac{2}{3}$ К) $(1 \frac{14}{17} - 1 \frac{1}{34}) * 34 = (1 \frac{28}{34} - 1 \frac{1}{34}) * 34 = 27/34 * 34 = 27$ Л) $(2 \frac{3}{4} + 4 \frac{1}{8}) * 1 \frac{5}{11} = (2 \frac{6}{8} + 4 \frac{1}{8}) * 16/11 = 6 \frac{7}{8} * 16/11 = 55/8 * 16/11 = (55/11) * (16/8) = 5 * 2 = 10$ М) $1 \frac{2}{5} * (1 \frac{1}{14} - 5/7) = 7/5 * (1 \frac{1}{14} - 10/14) = 7/5 * (15/14 - 10/14) = 7/5 * 5/14 = (7 * 5) / (5 * 14) = 1/2 = 0,5$ Н) $4 \frac{3}{8} * (1 \frac{3}{7} - 34/35) = 35/8 * (1 \frac{15}{35} - 34/35) = 35/8 * (50/35 - 34/35) = 35/8 * 16/35 = 16/8 = 2$