(   )
   (   )
  =100000000000000000...  = 1000000000000000000
  =100000000000000000...  = 1000000000000000000
  =100000000000000000...  = 1000000000000000000
  =100000000000000000...  = 1000000000000000000
   (   )
   (   )
   (   )
   (   )
   (   )