(-3/7*1/4)*(-4); (-5целых 6/7*3/13)*(-4целых 1/3)

(-3/7 * 1/4) * (-4) = - 3/7 * (1/4 * (-4)) = - 3/7 * (-1) = 3/7(- 5 целых 6/7 * 3/13) * (- 4 целых 1/3) = - 5 целых 6/7 * (3/13 * (-13/3) = - 5 целых 6/7 * (-1) = 5 целых 6/7Пояснения:4 целых 1/3 = (4*3+1)/3 = 13/3