( 1 )计算: 4 sin 60 ° ﹣ 12 + 3 - 1 0 ;
( 2 )化简 ( x + 1 ) ÷ ( 1 + 1 x ) .
(1)(2)
计算:
计算:.
(1)|-3|+(-1)0-+(2)3-|-2 |-