(-1)+(+2)+(-3)+(+4)+.+(-2003)+(+2004) 怎么算啊算理是甚么
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(-1)+(+2)+(-3)+(+4)+.+(-2003)+(+2004) 怎么算啊算理是甚么
(-1)+(+2)+(-3)+(+4)+.+(-2003)+(+2004) 怎么算啊
算理是甚么
(-1)+(+2)+(-3)+(+4)+.+(-2003)+(+2004) 怎么算啊算理是甚么
(-1)+(+2)+(-3)+(+4)+.+(-2003)+(+2004)
=1+1+...+1
=1×2004÷2
=1002
每2个数看成1组
2004/2=1002
从第一个数起,每两个数分成1组
每组和都是1
2004个数有1002组,因此和是1002
每相邻2个数字相加和都是1,所以,最后等于1002
(-1)+(+2)+(-3)+(+4)+.......+(-2003)+(+2004)
=(2004-2003)+(2002-2001)+........+(4-3)+(2-1)
=1+1+......+1+1 (一共2004÷2个1相加)
=1002