... ( 2x - 2 )31 là : A, 8x3 - 27 1 B , 8x 2 - 2x 2 + 27 13 2 −x C , 8x 2 - 2x 2 + 27 13 2 −x D, 8x 2 - 2x 2 + 27 13 2 −x 2. ( =− 2 )3 2 1xA. 9 2 274981 23 +++xxx ... ( 2x - 2 )31 là : A, 8x3 - 27 1 B , 8x 2 - 2x 2 + 27 13 2 −x C , 8x 2 - 2x 2 + 27 13 2 −x D, 8x 2 - 2x 2 + 27 13 2 −x 2. ( =− 2 )3 2 1xA. 9 2 274981 23 +++xxx ... 4y 2 3. ( =− 2 )5,0 2 1x A. 25 ,0 2 1 2 1 2 +−xx B. 5,0 2 1 2 1 2 −−xx C. 5,0 2 1 2 1 2 +−xx D. 5,0 2 1 2 +−xx4. (x -2) .(x +2) =A. x 2 + 4 A. x 2 - 4 A. x 2 - 2 A. x 2 ...