сложите дроби и, если возможно,сократите получившуюся дробь: а) 3/7+1/7 б) 3/10+2/10 в) 1/3+2/3 г) 1/7+2/7+3/7 д) 2/15+4/15+4/15 е) 4/17+9/17+7/17
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