1.(+1)+(-2)+(+3)+(-4)+^^^^(省略号)+(+99)+(-100) (请写出过程)2.(1-1/2)+(1/_数学解答

1.(+1)+(-2)+(+3)+(-4)+^^^^(省略号)+(+99)+(-100) (请写出过程)
2.(1-1/2)+(1/2-1/3)+(1/3-1/4)+^^^^(省略号)+(1/2001-1/2002) (请写出过程)
3.1/1*2 + 1/2*3 + 1/3*4 +^^^^(省略号)+1/2001*2002 (请写出过程)

人气：289 ℃　时间：2020-07-09 05:59:27

解答

1.=(1-2)+(3-4)+.+(99-100)=(-1)+(-1)+.+(-1)=-502.=1+(-1/2+1/2)+(-1/3+1/3)+.+(-1/2001+1/2001)-1/2002=1-1/2002=2001/20023.楼主没加括号吧?应该是1/(1*2)+1/(2*3)+...如果是,则=(1-1/2)+(1/2-1/3)+(1/3-1/4)+.(1...