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S1=2+4+6.....+1000 calculați sumeke

Răspuns :

=(1000x1001)/2-1 faci suma gaus 1+2+3+.....+1000 si scazi 1

S1=2+4+6.....+1000 =
=2(1+2+3+...+500)=
=2*500*501/2=500*501=250500