结果
10000...00000共4010个0
999...999*999...999+1999...999
=999...999*999...999+1000...000+999...999
=999...999(999...999+1)+1000...000
=999...999*1000...000+1000...000
=1000...000(999...999+1)
=1000...000*1000...000
=10000...0000(4010个0)
其中999...999代表共有2005个9
1000...000代表共有2005个0