Question

Ajutor la 2 si 3!!!!!!!!!!!!!!!!!

Answer 1

fie x , pretul initial
dupa o marire cu 20% el ajunge la x+20x/100=x+0,2x=1,2x

acest pret se va mari si el cu 20% din 1,2 x
1,2x=0,2*1,2x= 1,2x(1+0,2)=1,2x*1,2=1,2*1,2x=1,44x
1,44x=288
x=288:1,44
x=28800:144
x=200



5(1+2+...+20)/6(1+2+...+20)=5/6 rasp corect D