计算: - | - 1 | + 12 ⋅ cos 30 ∘ - - 1 2 - 2 + ( π - 3 . 14 ) .
计算:
计算:(1)()-1-3tan60°+;(2)(a+2)(a-2)-(a-1)2.
计算:(1)(2)
计算(每小题6分,满分12分)(1) (2)