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Decompuneti in factori primi numerele 64, 120 si 84, apoi in suma de cate 7 termeni fiecare.

Răspuns :

Jumpercs16
64:2=32:2=16:2=8:2=4:2=2:2=1  64=2^6
120:2*5=12:2=6:2=3:3=1    120=2³*3*5
84:2=42:2=21:3=7:7=1        84=2²*3*7
4+5+6+7+15+14+13=64
9+11+20+12+28+22+18=120
8+5+11+12+15+16+17=84

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