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arata-ti ca nr a=31+2+4+6+...+60 este patrat perfect.

Răspuns :

[tex]31+2+4+...+60=31+2(1+2+3+...+30)=31+2* \frac{30*31}{2}=31 [/tex][tex]+30*31=31(30+1)=31*31= 31^{2} [/tex] - pătrat perfect.