Врешении примера: (23*1/21 : 1*3/7 -5,5) : 3,19 - 1*17/18 = ?

(35/18×27/14 - 21/8 : 39/20) : (181/78-27/26) = (35/18×27/14 - 21/8 : 39/20)/(181/78 - 81/78) = (3 3/4- 1 9/26) : 100/78 = 2 21/52 : 1 22/78 = 1 7/8.