2
1, if
1
( )
1, if
1
x
x
f x
x
x
+
≥
= 
+
<

11 3
2
3, if
2
( )
1,
if
2
x
x
f x
x
x

−
≤
= 
+
>

12 10
2
1, if
1
( )
,
if
1
x
x
f x
x
x

−
≤
= 
>

13 Is the function defined by
5, if
1
( )
5, if
1
x
x
f x
x
x
+
≤

=  −
>

a continuous function