Question

x,1+x,2+......x,9=22,5
Aflati x
Va rog....urgent

Answer 1

Răspuns:

Suma are 9 termeni

x+1/10+x+2/10+x+3/10+...+x+9/10=225/10

(a+x+x+....+x)(de 9 ori+(1+2+3+...+9)/10=225/10

9x+(9*10/2)/10=225/10

9x+45/10=225/10

9x=225/10-45/10

9x=180/10

9x=18

x=2

Explicație pas cu pas: