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Efectuati calculele: a)5/12+9/12; b)4/15-7/15; c)2/21+1/7;

Răspuns :

5/12+9/12 =14/12  =7/6 =1. 1/6
4/15 -7/15 = -3/15 = -1//5
2/21 +1/7 =2/21 =3/21 =5/21