( 1 )计算: 4 sin 60 ° ﹣ 12 + 3 - 1 0 ;
( 2 )化简 ( x + 1 ) ÷ ( 1 + 1 x ) .
.计算:-2+(π-1)0+tan60°-;
计算:
(本小题满分7分) 计算:
计算:(1)
计算:(每题4分) (2)