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Cum se descompune:
2kpatrat+3k+1


Răspuns :

[tex]2k^2+3k+1 =2k^2+2k+1+k=(k+1)^2+k[/tex]
[tex]2k^2+3k+1=2k^2+k+2k+1=k(2k+1)+(2k+1)= \\ \\ =(2k+1)(k+1)[/tex]