👤

dupa ce se scade 16 % dintr-un numar , se obtine 434 . Aflati numarul .
 mersi mult !!



Răspuns :

Notam cu x nr initial
x-16/100x=434
100/100x-16/100x=434
84/100x=434
x=434×100/84
x=516.(6)
notam cu x=numarul       x-16/100x=434  aducem la acelasi numitor    16/100=4/25             x-4/25x=434     25x-4x=10.850     21x=10850    x=10850/21   x=516,(6)