1 .   l(ƜTX  x
 
 
 
 l(ƜTր? 
 
 	 \t  0(X  
 
 	  0  X  ( \  x\  (  
 
 
 
 l(ƜTX  x  
 
 	 T  ̸  <\  x\  tǰTЌ  0
 
 	 P  X  Ō  X\  tǰTЌ  0
 
 	 Ͱ,     |  XՔ  T     0
 
 	  ƼX  ɹT
 
 	 TY  D̸  X   
 
 
 
 2 .   l(ƜT     )H
 
 
 
   ơ  8
 
 	   P  |X  T̸    
 
 	   X    T
 
 	 2  ёX   @  tՑ  8
 
 	   (X   
 
 
 
 \  8
 
 	 DՔ\      t0
 
 	 |,   Dв  @   Ȉ    t0
 
 	  P  tǩ
 
 	 \Xֽ  D@  \֩