问题 解答题
计算:(
x-2
x+2
+
4x
x2-4
)÷
1
x2-4
答案

x-2
x+2
+
4x
x2-4
)÷
1
x2-4

=

x-2
x+2
×(x+2)(x-2)+
4x
x2-4
×(x2-4)

=(x-2)2+4x

=x2-4x+4+4x

=x2+4

单项选择题
单项选择题