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Rezolvati in multimea nr reale urmatoarea ecuatie

Rezolvati In Multimea Nr Reale Urmatoarea Ecuatie class=

Răspuns :

(1+2+..+(x-1))/x=3
 
1+2+..+x-1=3x
(x-1)*x/2=3x
(x-1)/2=3
x-1=6
x=7

 verificare 1/7+2/7+...+6/7=3
6*7/(2*7)=3
adevarat , bine rezolvat
As simple as that!