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ImAdiTzZu
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Răspuns :

3. a) 2/3+5/7 = 14+15/21=29/21
b) 5/7+3/14 = 10+3/14=13/14
c) 3/20+7/30 = 9+14/60= 23/60
d) 2/15+1/10=4+3/30=7/30
e) 5/6+2/7 =35+12/42=47/42
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