9999…9×9999…9

问题描述:

9999…9×9999…9
2006个9 2006个9

=999...9*(100.0-1) (2006个9和2006个0)
=999...900...0-999...9 (2006个9和2006个0)
=999...9800...01 (2005个9,2005个0)