Ответ:
Пошаговое объяснение:
1) 20 : 2 2/15 = 20 : 32/15 = 20 * 15/32 = 5 * 15/8 = 75/8 = 9 3/8
2) 25 5/7 : 2 2/35 = 180/7 : 72/35 = 180/7 * 37/72 = 5/7 * 37/2 = 185/14 = 13 3/14
3) 9 3/8 + 13 3/14 = 9 42/112 + 13 24/112 = 22 66/112 = 22 33/56
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20 7/9 : 4 2/5 = 187/9 : 22/5 = 187/9 * 5/22 = 935/198 = 4 143/198