问题 解答题
化简:
x2+4
x-2
+
4x
2-x
答案

x2+4
x-2
+
4x
2-x
=
x2+4
x-2
-
4x
x-2
=
x2+4-4x
x-2
=
(x-2)2
x-2
=x-2.

判断题
单项选择题