1+2-3-4+5+6-7-8+9+10.+997+998-999-1000,卜晓得杂个解啊```求各大高手```
问题描述:
1+2-3-4+5+6-7-8+9+10.+997+998-999-1000,
卜晓得杂个解啊```
求各大高手```
答
(1+2-3-4)+(5+6-7-8)+.....+(997+998-999-1000)
=-2*(1000/4)
=-2*250
=-500
答
1+(2-3)+(5-4)+(6-7)+(9-8)+……+(997-996)+(998-999)-1000
=1+(-1+1)+(-1+1)……+(-1+1)-1000
=1-1000
=-999
答
原式=1-(3-2)+(5-4)-(7-6)+(9-8)-(11-10)+……-(999-998)-1000
=1-1+1-1+1-1+……-1-1000
=0-1000
=-1000
答
1+(2-3)+(-4+5)+(6-7)+(-8+9)+......(998-999)-1000
=1+(-1+1-1+1.....-1)(单数,499个)-1000
=1-1-1000=-1000