(2分之1)的-3次方×0.25+2012-6
=1/(1/2)³×1/4+2012-6
=8×1/4+2006
=2008
(x+3)²-(x-1)(x-2)
=x²+6x+9-(x²-3x+2)
=x²+6x+9-x²+3x-2
=9x+7
=-9+7
=-2
(2分之1)的-3次方×0.25+2012-6
=1/(1/2)³×1/4+2012-6
=8×1/4+2006
=2008
(x+3)²-(x-1)(x-2)
=x²+6x+9-(x²-3x+2)
=x²+6x+9-x²+3x-2
=9x+7
=-9+7
=-2