问题
填空题
二999×二998二998-二998×二999二999=______.
答案
2006×20082008-2008×20062006,
=2006×2008×10001-2008×2006×10001,
=0.
二999×二998二998-二998×二999二999=______.
2006×20082008-2008×20062006,
=2006×2008×10001-2008×2006×10001,
=0.