问题 填空题
x>
1
4
,则
x+
1
2
+
1
2
4x+1
-
x+
1
2
-
1
2
4x+1
=______.
答案

x+
1
2
±
1
2
4x+1
=
2x+1±
4x+1
2
=
1
2
4x+2±2
4x+1
=
1
2
(
4x+1
±1)
2
=
1
2
|
4x+1
±1|,

x>

1
4
时,原式=
1
2
(
4x+1
+1)-
1
2
(
4x+1
-1)=1

判断题
判断题