问题 解答题
(
3x
x-2
-
x
x+2
x2-4
x
答案

(

3x
x-2
-
x
x+2
x2-4
x

=

3x
x-2
×
(x+2)(x-2)
x
-
x
x+2
×
(x+2)(x-2)
x

=3(x+2)-(x-2)

=3x+6-x+2

=2x+8.

单项选择题
单项选择题