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Aflati nr. natural x daca: 3+6+9...+297=150x

Răspuns :

3(1+2+..+99)=150x

3*99*100/2=150x

3*99*50=150x

99*150=150x

x=99


(3+297)*100=150x/ :50
300*2=3x/ :3
100*2=x
x=200