сложить дроби а) 1/2+1/3 б) 1/2+1/5 в) 1/3+1/4 г) 1/4+1/5 д) 1/2+1/4 ё) 1/3+1/6 ж) 1/2+1/6 з) 1/4+1/8пожалуста сделайте
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