Сложите дроби. ПЭЖЭЖА, ВОТ ОЧ НАДО!!!

И желательно с полным решением.

(а)7/10+1/10=;

(б)7/12+1/4=;

(в)1/5+2/15=;

(г)5/6+1/9=;

(д)2/9+1/12=;

(е)7/24+1/60=;

(ж)1/42-2/63=;

(з)5/12+3/20=;
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