2005+2004-2003-2002+2001+2000-1999-1998+1997+1996-.-7-6+5+4-3-2+1

2005+2004-2003-2002+2001+2000-1999-1998+1997+1996-.-7-6+5+4-3-2+1

Analysis: a total of 2005, from the beginning to the end, every four groups, the sum of each group is 4. A total of 2005÷4=501 groups 1, the additional number is the last 1. A total of 501 4 plus 1.
2005÷4=501...1
501×4+1=2004+1=2005

Analysis: a total of 2005 number, from the beginning, every four groups, the sum of each group is 4. A total of 2005÷4=501 groups 1, the remaining one is the last 1. A total of 501 4 plus 1.
2005÷4=501...1
501×4+1=2004+1=2005

The absolute value of (x+2)2n power plus y minus 3 is equal to 0. (X+2) The absolute value of 2nth power plus y minus 3 is equal to 0.

Absolute value of (x+2)^2n+(y-3)=0.
Then x+2=0, x=-2;
Y-3=0, y=3.
So, x^y=(-2)^3=-8.
Don't leave messages for the best.

Absolute value of (x+2)^2n+(y-3)=0.
Then x+2=0, x=-2;
Y-3=0, y=3.
So, x^y=(-2)^3=-8.
Don't leave a message for the best.

Absolute value of (x+2)^2n+(y-3)=0.
Then x+2=0, x=-2;
Y-3=0, y=3.
So, x^y=(-2)^3=-8.
Don't leave a message. Best.