(1)计算: ( - 2 ) 2 + tan 45 ° - ( 3 - 2 ) 0
(2)化简: x ( x + 1 ) - ( x + 1 ) ( x - 2 )
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)