Thực hiện phép tính: ( x + 1 )^3 - x( x - 2 )^2 - 1; ( x - 2 )^3 - x^2( x - 6 ); ( x + 1 )( x^2 + x + 1 )( x - 1 )( x^2 - x + 1 ); 27 + ( x - 3 )( x^2 + 3x + y ); ( x - 1 )^3 - ( x + 2 )( x^3 - 2x + 4 ) + 3( x + 4 )( x - 4 ); 8x^3 - 5 - ( 2x + 1 )( 4x^2 + 2x + 1 ); ( x + 2 )^3 - ( x - 2 )^3 - 12x^2