Виконай дію: 1) 8 14/17 + 13/17; 2) 9 20/23 + 3 18/23 ;3) 18 2/13 – 2 7/13; 4) 12 5/11 – 8 10/11 ; 5) 9 1/13 – 4 10/13; 6) 5 2/29 – 17/29.
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