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Suma lui Gauss
(11+12+13+...+100): 34 =


Răspuns :

nr termeni =100-11+1=90

11+12+13+...+100=10+1+10+2+10+3+...10+90=
=10×90+1+2+3+..90=900+90×91:2=900+45×91=900+4095=4995


(11+12+13+...+100): 34  =4995:34≈146,91..