先化简,再求值: ( 1 x + 3 - 1 3 - x ) ÷ 2 x - 3 ,其中, x = 3 - 3 .
计算: (1)(2) (3)(4)
计算:(每小题4分,共8分) (1); (2)
计算:
计算: |-4|-(2-)0+
.计算:-2+(π-1)0+tan60°-;