Question

rezolvarea problemei Aflați numărul natural x dacă 3 plus 6 plus 9 plus puncte puncte plus 297 egal 150 x

Answer 1

3+6+9+...+297=150x

Mai intai rezolvam 3+6+9+...+297 prin suma gauss

Formula gauss:n[(n+1):2]

3+6+9+...+297=

3(1+2+3+....+99)=

3×99[(99+1):2]=

3×99×(100:2)=

3×99×50=1485000

1485000=150x

X=1485000:150

X=99