Выполни сложение дробей:
3/7+1/9;  3/10+1/8;  7/12+4/15;  3/4+5/6;  2/5+3/7;  9/14++2/21;  2/3+2/151/12+5/9;  3/20+6/25;  1/3+5/8;  1/6+2/9;  7/9+2/15
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