(1,75:2/3-1 3/4*1 1/8)
(1,75 / 2/3 - 1 3/4 * 1 1/8) = (7/4 / 2/3 - 7/4 * 9/8) = 7/4(2/3 - 9/8) = 7/4 (16/24 - 27/24) = 7/4 * (- 11/24) = - 77/96