Вычислите: а) 1/5 + 3/5 б) 1/2 + 1/2 в) 7/10 + 4/10 г) 3/8 + 5/8 д) 5/16 + 3/16 е) 3/20 + 7/20 ж) 8/19 + 1/19 з) 7/91 + 13/91
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