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1+2+3...100 va rog frumos

Răspuns :

1+2+3+...+100=
100*(100+1):2=
100*101:2=
10100:2=
5050
[tex]\displaystyle 1+2+3+...+100= \frac{100(100+1)}{2} = \frac{100 \times 101}{2} = \frac{10100}{2} =5050[/tex]