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9+46+83+120+...+1119+1156=
Cum se rezolva cu suma Gauss?


Răspuns :

S=9+46+83+120+....+1119+1156
S=9+(9+37)+(9+37*2)+(9+37*3)+.....+(9+30*37)+(9+31*37)
S=9+9+9+....+9 (de 32 ori) + 37(1+2+3+....+31)
S=9 * 31 + 37 * (31*32)/2
S=279+37*31*16
S=279+18352
S=18631
Sper ca te-am ajutat.