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Calculați; 5/3-9/3; 1/48-1/72; 12 2/3-5 5/9;

Răspuns :

5/3-9/3 = - 4/3 

1/48-1/72 = 3/144 - 2/144 = 1/144;

12 2/3-5 5/9 = 38/3 - 50/9  = 114/9 - 50/9 = 64/9 = 7*1/9