1-2+3-4+5-6+7-8.......-2016+2017
=(1-2)+(3-4)+(5-6)+(7-8)+.....+(2015-2016)+2017
=-1+(-1)+(-1)+(-1)+.....+(-1)+2017
=-1*2016/2+2017
=-1008+2017
=1009
1-2+3-4+5-6+7-8.......-2016+2017
=1+(-2+3)+(-4+5)+(-6+7)+...+(-2016+2017)
=1+1+1+1+...+1(共1+(2017-1)/2=1+1008=1009个)
=1009
答案应该是1009