(4 и 2/9 - 3 и 5/6) делить на (-7/18)

(38/9-23/6)/(-7/18)= (76/18-69/18)/(-7/18)=(7/18)/(-7/18)= (7/18) * (18/-7)= -1

(4 2/9 - 3 5/6) : (- 7/18) 38/9 - 23/6 = (76-69) / 18 = 7/18 7/18 : (-7/18) = 7/18 * (-18/7) = -1