1)11,7 : 1 целая 6/7 = 117/10 : 13/7 = 117/10 *7/13 = 63/10 = 6,3
2)12 4/5 * 3 ц 3/4 - 4 ц 4/11 *·4 ц 1/8
(черта дроби)
11 ц 2/3 : 7/18
12 4/5 * 3 3/4 = 64/5 * 15/4 = 48
4 4/11 * 4 1/8 = 48/11 * 33/8 = 18
48 -18 = 30
11 2/3 : 7/18 = 35/3 * 18/7 = 30
30 : 30 = 1