a)2008100 + 200899 = 200899.(1 + 2008)=200899.2009
Từ đó suy ra : 200899+2008100 chia hết co 2009
b)
12345678 - 12345677 = 12345677. ( 12345 - 1 ) = 12345677 . 12344
=> 12345678 - 12345677 chia hết cho 12344
k nha ><Thanks
Ta có: \(2008^{100}+2008^{99}=2008^{99}\left(2008+1\right)\)
\(=2008^{99}.2009\)
Vậy \(2008^{100}+2008^{99}⋮2009\)