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calculează(4+8+12+16+....+204 (2+4+6+....+102)

Răspuns :

s=(1+204)×204:2
s=205×204:2
s=40.800:2
s=20.400

s=(1+102)×102:2
s=103×102:2
s=10.506:2
s=5.253

am facut asa deoarece 2+4+6 sunt consecutive