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ajutor!!!! rezolvati va rog : 2+4+6+...50

Răspuns :

2+4+6+8+10+12+14+16+18+20+...50 =650 

poti face: 50-6-4-2= 44-4-2= 40-2=38 proba:2+4+6+38= 6+6+38= 12+38=50