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Calculati:1+2+3+4+5•••••+145,
2+4+6+8+....200,

Răspuns :

Chris02Junior
Sume Gaus(progresii aritmetice).
Ratia r=1, termeni 145
S1= 145(1+145):2 = 145x 73 = 10585
S2= 2(1+2+3+4+...+100) = 2x100x(1+100) : 2 = 100x101 = 10100.
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