Ответ:
Пошаговое объяснение:
a)
1) 3 2/5 : 17/20 = 17/5 * 20/17 = 4
2) 4 1/2 - 4 = 1/2
3) 11/15 * 1/2 = 11/30
4) 11/30 + 1 11/20 = 22/60 + 1 33/60 = 1 55/60 = 1 11/12
ответ: 1 11/12
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б)
1) 5 2/15 * 3/22 = 77/15 * 3/22 = 7/10
2) 7/10 + 1 14/15 = 21/30 + 1 28/30 = 1 49/30 = 2 19/30
3) 5 4/7 : 1 5/21 = 39/7 : 26/21 = 39/7 * 21/26 = 9/2 = 4 1/2
4) 4 1/2 - 2 19/30 = 4 15/30 - 2 19/30 = 3 45/30 - 2 19/30 = 1 26/30 = 1 13/15
ответ: 1 13/15