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Suma S=3+6+9+.....+300 este egal cu. Va rog mult!!Urgent!!dau coroana!

Răspuns :

S=3+6+9+...+300
S=300+297+294+...+3
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2S=303+303+303+...+303
Sunt 100 de termeni in sir
303x100=30300 (2S)
S=30300:2
S=15150