(1,75 : 2/3 - 1 3/4 : 1,125 )* 1 5/7
(1,75 : 2/3 - 1 3/4 : 1,125) * 1 5/7 1,75 : 2/3 = 1 3/4 : 2/3 = 7/4 : 2/3 = 7/4 * 3/2 = 21/8 1 3/4 : 1,125 = 1 3/4 : 1 1/8 = 7/4 : 9/8 = 7/4 * 8/9 = 14/9 21/8 - 14/9 = 77/72 77/72 * 1 5/7 = 77/72 * 12/7 = 11/6 = 1 5/6