1 1/8 = 1 + 1/8 = 8/8 + 1/8 = 9/8
2/18 = 1/9
1,75 : 9/8 + 1/9 = 1,75 * 8/9 + 1/9 = 1,75 * 8/9 + 1/9 = (1,75 * 8 + 1)/9 = (14 + 1)/9 = 15/9 = 5/3 = 1 2/3
Ответ: 1 2/3