1)- 5 1/16 + 1 1/18 = - 81/16 + 19/18 =(-81 * 9 + 19 * 8)/144 = -729/144 + 152/144 = - 577/144 = - 4 1/144
2)- 5/6 - 3/4 =(-5 * 2 - 3 * 3)/12 = -10/12 - 9/12 = - 19/12 = - 1 7/12
3)- 4 1/144 * (- 1 7/12) = - 577/144 * ( - 19/12) = 10963/1728 = 6 595/1728
ответ 6 595/1728