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efectuati : a) 7/15+8/15 b) 31/13-5/13.

Răspuns :

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Vezi imaginea STIUCA96

a)

7/15 + 8/15 = (7 + 8)/15 = 15/15 = 1

b)

31/13 - 5/13 = (31 - 5)/13 = 26/13 = 2