`20092009 × 200820082008 - 200920092009 × 20082008`
`= 2009 × 10001 × 2008 × 100010001 - 2009 × 100010001 × 2008 × 10001`
`= 2009 × ( 1001 - 1001 ) - 2008 × ( 100010001 - 100010001 )`
`= 2009 × 0 - 2008 × 0`
`= 0 × ( 2009 - 2008 )`
`= 0 × 1`
`= 0`
`#dtkc`