а) 1 - 9/16 / 3/8 - 1/8 = -5/8 = 0,625;Первое действие.9/16 / 3/8 = 9/16 * 8/3 = 9 * 8/16 * 3 = 3/2 = 1 1/2;Второе действие.1 - 1 1/2 = -1/2;Третье действие.-1/2 - 1/8 = -4/8 - 1/8 = (-4 - 1)/8 = -5/8 = 0,625;б) (4 - 2/3) * (1 1/2 + 3/4) = 7 1/2 = 7,5;Первое действие.4 - 2/3 = 3 3/3 - 2/3 = 3 1/3;Второе действие.1 1/2 + 3/4 = 3/2 + 3/4 = 6/4 + 3/4 = (6 + 3)/4 = 9/4 = 2 1/4;Третье действие.3 1/3 * 2 1/4 = 10/3 * 9/4 = 10 * 9/ 3 * 4 = 15/2 = 7 1/2 = 7,5;в) (1/2 + 1/4) / 6 = 1/8 = 0,125;Первое действие.1/2 + 1/4 = 2/4 + 1/4 = (2 + 1)/4 = 3/4;Второе действие.3/4 / 6 = 3/4 * 1/6 = 3 * 1/4 * 6 = 1/8 = 0,125;