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grupeaza convenabil termenii si efectueaza:
a) 11+12+13+14+15+16+17+18+19


Răspuns :

11+19+12+18+13+17+14+16+15

30+30+30+30+15

60+60+15

120+15

135


11+19=30
12+18=30
13+17=30
14+16=30
30+30+30+30+15=135