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calculati(3+6+9+ ...+300):(1+2+3+ ...+100)

Răspuns :

Saoirse1
=3(1+2+3+....100):(1+2+3+...100)=3
ScoalaPentruToti
3+6+9+...+300
3×1+3×2+3×3+...+3×100
3×(1+2+3+...+100)
3×(100×101:2)
3×(50×101)
3×5050=15150

100×101:2
50×101=5050

15150:5050=3
R:3

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