Пошаговое объяснение:
1) 2 4/15 - 1 5/12 = 2 16/60 - 1 25/60 = 1 76/60 - 1 25/60 = 51/60 = 17/20
2) 17/20 : 3 2/5 = 17/20 : 17/5 = 17/20 * 5/17 = 1/4 * 1/1 = 1/4
3) 1/4 + 6 4/9 = 9/36 + 6 16/36 = 6 25/36
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Пошаговое объяснение:
1) 2 4/15 - 1 5/12 = 2 16/60 - 1 25/60 = 1 76/60 - 1 25/60 = 51/60 = 17/20
2) 17/20 : 3 2/5 = 17/20 : 17/5 = 17/20 * 5/17 = 1/4 * 1/1 = 1/4
3) 1/4 + 6 4/9 = 9/36 + 6 16/36 = 6 25/36