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Ioanavaleria200
a fost răspuns

Aflati numarul natural x, astfel incat: 11 + 12 + ... + 100 = 5(1 000x - 1).

Răspuns :

Saoirse1
11+12+...100=(11+100)(100-10)/2=111*90/2=111*45=4995 => 5(1000x-1)=5*999 => 1000-x=999 => x=1000-999 => x=1
Deliuca
11+12+...100=(11+100)(100-10)/2=111*90/2=111*45=4995 => 5(1000x-1)=5*999 => 1000-x=999 => x=1000-999 => x=1

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