1+2-3-4+5+6-7-8+9+10+...2009+2010-2011-2012=(1-3)+(2-4)+(5-7)+(6-8)+...+(2009-2011)+(2010-2012)=-2+(-2)+(-2)+(-2)+...+(-2)+(-2)=-2×(2012÷2)=-2012;您好,很高兴为您解答,skyhunter002为您答疑解惑如果本题...