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Обчисліть: 1) 2/5 + 3/10 = 4/10 + 3/10 = 7/10; 2) 1/4 + 3/28 = 7/28 + 3/28 = 10/28 = 5/14; 3) 7/12 + 1/4 = 7/12 + 3/12 = 10/12 = 5/6; 4) 2/5 + 3/25 = 10/25 + 3/25 = 13/25; 5) 2/7 + 5/14 = 4/14 + 5/14 = 9/14; 6) 5/9 + 1/3 = 5/9 + 3/9 = 8/9; 7) 4/27 + 2/9 = 4/27 + 6/27 = 10/27; 8) 1/9 + 5/18 = 2/18 + 5/18 = 7/18.





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