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efectuati calculele a) -7/11:14/22-19/38 b) 3/7-5/2*3/15 c) -9/5*35/63-3/7:15

Răspuns :

a) -1-1/2=-3/2

b)3/7-1/2= (6-7)/14=-1/14

c)-1-1/27=-28/27