1)15-7 3/5 + 0+2 7/8

2)8 5/12+5/6-5 3/4- 2 1/2

3)((7 4/9-2 3/10))+((1 7/9+4-2/9-5 1/2))

4)5 1/2-((1 3/14+11/21))+((4 5/12-2))​
по действиям ​
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