问一道数学题超难······简便计算1.（2005+2006+2007+2008+2009+2010+2011）÷20082.20092009×2008与20082008×2009的结果相差多少?3.9999×2222+3333×3334注意,一定要简便计算.
2019-05-22
问一道数学题超难······简便计算
1.（2005+2006+2007+2008+2009+2010+2011）÷2008
2.20092009×2008与20082008×2009的结果相差多少?
3.9999×2222+3333×3334
注意,一定要简便计算.
优质解答
（2005+2006+2007+2008+2009+2010+2011）÷2008
=(2008-3+2008-2+2008-1+2008+2008+1+2008+2+2008+3)÷2008
=2008×7÷2008
=7
20092009×2008-20082008×2009
=10001×2009×2008-10001×2008×2009
=0
9999×2222+3333×3334
=3333×3×2222+3333×3334
=3333×（6666+3334）
=3333×10000
=33330000
（2005+2006+2007+2008+2009+2010+2011）÷2008
=(2008-3+2008-2+2008-1+2008+2008+1+2008+2+2008+3)÷2008
=2008×7÷2008
=7
20092009×2008-20082008×2009
=10001×2009×2008-10001×2008×2009
=0
9999×2222+3333×3334
=3333×3×2222+3333×3334
=3333×（6666+3334）
=3333×10000
=33330000