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Aflați nr nat x daca:3+6+9+....+297=150x


Răspuns :

3+6+9+....+297=150x
3(1+2+3+...+99)=150x
3×(99×100/2)=150x
3×9900/2=150x
3× 4950=150x
x=4950×3/150
x=495/5
x=99