1) действия в скобках : 30:27-1/3
30/27-1/3= 7/9
2) 7/9 • 2 1/7 = 1 2/3
3) 1 2/3 + 2/5 = 2 1 / 15
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1) действия в скобках : 30:27-1/3
30/27-1/3= 7/9
2) 7/9 • 2 1/7 = 1 2/3
3) 1 2/3 + 2/5 = 2 1 / 15