2 4 or 0
3 0
4 4.80* 10^4
5 0 or-1 0
6 a+b=0 cd= 1 x=2 y=0
xy？ -208th power of (A+B+CD) X+(A+B)-2008th power of (CD)
=0-2+0- 1=-3
7 3 3≤x≤6
8 (- 1+2)+(-3+4)+(-5+6)+……+(- 1003+ 1004)+ 1005-(- 1006+ 1007)+……+(-2006+2007)-2008= 1005+ 1* 1003-2008=0
9 ( 1-2)+(3-4)+……+(2007-2008)+2009=2009- 1004= 1005
10 Original formula = (-2) power of 2009+(-2) power of 2008 ×
2008 power of (-2/3) ×(-3/3) ×(-3/3).
Power of 2009 = (-2) = Power of 4 of 2007 * (-2)-3 * (-2) = Power of 2007-2.
1 1 x≥ 1 y≥-4
12 when x= 1005, the original formula = (1004+1003+...+1) * 2 =1009020.
I hope it helps you.