计算:
(1) | - 2 3 | - 12 + ( 1 3 ) - 2 ;
(2) ( x - 2 ) 2 - ( x + 2 ) ( x - 2 ) .
计算
计算:tan60°+2sin45°-2cos30°
计算: ( - 2 ) 2 - | - 1 | + ( 2013 - π ) 0 - 1 2 - 1 .