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Nycopysyco
a fost răspuns

d 5+ 8 + 11 + ... + 305=suma Gauss DETALIAT​

Răspuns :

Elean123

5+8+11+...+305=

=(3×0+5)+(3×1+5)+(3×2+5)+...+(3×100+5)

=3(0+1+2+...+100)+(5+5+...+5)101 de 5

=3(100×101:2)+5×101

=3(101×50)+505

=3×5050+505

=15150+505

=15655

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