Răspunsuri

2014-10-15T08:45:48+03:00
2x+4x+6x+...+18x=360,2x(1+2+3+...+9)=360,9x10:2=45,2x45=360,90x=360,x=4
Marcheaza-l daca e cel mai bun raspuns.Multumesccc