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Rezolvati ecuatiile:
10+20+30+...+x0=360


Răspuns :

10+20+...+x0=360; 10(1+2+3+...+x)=360; 1+2+3+...x=360:10=36; x(x+1):2=36; =>x(x+1)=36×2=72; x²+x=72=>x=8; 8²+8=64+8=72