(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)+2013简便计算,
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 11:47:19
![(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)+2013简便计算,](/uploads/image/z/135625-49-5.jpg?t=%28%2B1%29%2B%28-2%29%2B%28%2B3%29%2B%28-4%29%2B.%2B%28%2B2011%29%2B%28-2012%29%2B2013%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%2C)
(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)+2013简便计算,
(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)+2013简便计算,
(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)+2013简便计算,
(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)+2013
=1+(-2+3)+(-4+5)+(-6+7)+---+(-2012+2013)
=1+1+1+----+1 (1007个1)
=1007
=(1-2)+(3-4)+...+(2011-2012)+2013
=2013-(2012/2)
=1007
=1+(2-3-4+5)+(6-7-8+9)+...+(2010-2011-2012+2013)
=1+0+0+0+0+...+0
=1