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(2×+1) totul la a 2
(1_×+1)TOTUL LA A 2
2


Răspuns :

(2x+1)² = (2x)²+2*2x*1+1² = 4x²+4x+1
(1/2x+1)² = (1/2x)²+2*1/2x*1+1²  = 1/4x²+x+1