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Polinomul (x^2+x-1)^n -x este divizibil cu polinomul x^2 -1 daca si numai daca:
a) n=2k, k apartine N*
b) n=3k, k apartine N*
c) n=2k-1, k apartine N*
d) n=3k+1, k apartine N*
e) n=3k+2, k apartine N*
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152-http://pro-didactica.ro/forum/index.php?forumID=21&ID=27731
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