Найдите значения суммы и разности чисел 1) 7 11 / 12 и 4 9 / 16; 2) 25 13 / 42 и 19 9 / 14; 3) 5 7 / 30 и 3 11 / 18; 4) 49 3 / 20 и 38 1 / 12.
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