问题 解答题
计算下列各题
(1)|
3
-1|+sin30°-(5-tan60°)°+2-1=______;
(2)
1
x-2
-
2x
x2-4
=______.
答案

(1)原式=

3
-1+
1
2
-1+
1
2

=

3
-1;

(2)原式=

1
x-2
-
2x
(x+2)(x-2)

=

(x+2)-2x
(x+2)(x-2)

=

2-x
(x+2)(x-2)

=-

1
x+2

判断题
单项选择题