1
5=3s
1 ?¨?
?lw
1
2
11
1)( ) ',( ) 2 '
nn
znzn
zz
==?
^??
b
£ 1
122 1 1
00
()
()'lim lim( )
nn
nn
n
zz
zz z
zCzz
z
→?→
+
==+?+?=
5=3s
1 ?¨?
?lw
1
2
11
1)( ) ',( ) 2 '
nn
znzn
zz
==?
^??
b
£ 1
122 1 1
00
()
()'lim lim( )
nn
nn
n
zz
zz z
zCzz
z
→?→
+
==+?+?=