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Calculati :S= 5+10+15+...+85 S=5+10+
15+...+95
va rog ajutatima


Răspuns :

S = 5+10+15+...+85
S = 5×(1+2+3+...+17)
S = 5×17×18:2
S = 85 × 9
S = 765

S = 5+10+15+...+95
S = 5×(1+2+3+...+19)
S = 5×19×20:2
S = 95×10
S = 950