Выполните действия:
a)3/8 + 2/7; 

б) 59/60 +39/40;

в) 7/9 + 3/4;

г) 3 3/8 + 2 1/7;

д) 5/24 + 29/56;

е) 5 1/6 + 1 2/3
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