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determina nr naturale x pt care u×x+14×x+21×x+28×x+...+126×x=7×9×19

Răspuns :

x(u+14+21+28+............+126)=7*9*19
facem suma lui gauss⇒[(126-14):7]*(126+14)/2⇒17*70
x*u+1190x=1190⇒x=(u+1190):1190