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a)3 supra 5 ori1
b)2 supra 5ori 3supra7


Răspuns :

 A) 3/5 x 1 + 3/5 
B) 2/5 x 3/7= 6/35
3/5 x 1 = 3/5

2/5 x 3/7 = 2x3/5x7 = 6/35