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2014-09-22T22:10:55+03:00
A)(1+100)*100 totul supra 2=5050
b)(2+100)*8 totul supra2=408
  • Utilizator Brainly
2014-09-22T22:18:26+03:00
Folosesti suma lui Gauss  n(n+1):2


a)1+2+3+...+100

 100(100+1):2=100*101:2=10100:2=5050


b)2+4+6+...+100

   2(1+2+3+..........+50 ) =>\ \ am\ \ dat\ \ factor\ \ comun\ \ pe\ \ 2 \\  \\ 2(50*51):2=50*51=2550