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REZOLVATI : 
(x+2) LA A 3 A - (X+1) LA A 3 A= ?

Răspuns :

Renatemambouko
(x+2)³-(x+1)³=(x+2-x-1)(x²+4x+4+x²+2x+1+x²+2x+x+2)=
=3x²+9x+7
Cyborg
(x+2)³-(x+1)³ =[ (x+2)-(x+1) ] [ (x+2)²+(x+2)(x+1)+(x+1)² ]
(x+2)³-(x+1)³ =(x+2-x-1) (x²+4x+4+x²+x+2x+2+x²+2x+1)
(x+2)³-(x+1)³ =(3x²+9x+7)
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