1.(+1)+(-2)+(+3)+(-4)+^^^^(省略号)+(+99)+(-100) (请写出过程)
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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)
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)
1.=(1-2)+(3-4)+.+(99-100)
=(-1)+(-1)+.+(-1)
=-50
2.=1+(-1/2+1/2)+(-1/3+1/3)+.+(-1/2001+1/2001)-1/2002
=1-1/2002=2001/2002
3.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)+.(1/2001-1/2002)
=1+(-1/2+1/2)+(-1/3+1/3)+.+(-1/2001+1/2001)-1/2002
=1-1/2002=2001/2002
=(-1)+(-1)+.+(-1)
=-50
2.=1+(-1/2+1/2)+(-1/3+1/3)+.+(-1/2001+1/2001)-1/2002
=1-1/2002=2001/2002
3.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)+.(1/2001-1/2002)
=1+(-1/2+1/2)+(-1/3+1/3)+.+(-1/2001+1/2001)-1/2002
=1-1/2002=2001/2002
1.(+1)+(-2)+(+3)+(-4)+^^^^(省略号)+(+99)+(-100) (请写出过程)
计算(1+3+5+7+省略号+99+101)-(2+4+6+8+省略号+98+100)的结果是( )
1+2+3+省略号+99+100+99+98+省略号+3+2+1
100+99-98-97+96+95+…+4+3-2-1这题怎么做,请写出计算过程
请用简便方法计算下题(1)+(-2)+(3)+(-4)+.+(99)+(-100) 图中六个点是省略号在-49,-48,
(+1)+(-2)+(+3)+(-4)+...+(+99)+(-100),要写出计算过程.
已知A=1^2+3^2+5^2+省略号+97^2+99^2,B^2=2^2+4^2+6^2+省略号+98^2+100^2
已知A=1^2+3^2+5^2+省略号+97^2+99^2,B=2^2+4^2+6^2+省略号+98^2+100^2.求
1/1+2+1/1+2+3+1/1+2+3+4+省略号+1/1+2+省略号+99
1+2+3+L+99+100+99+98+L+1等于多少?计算过程请写出来.
(-1)+2+(-3)+4+(-5)+6+(省略号)+(-99)+100等于多少?
1*100+2*99+3*98+4*97+(省略号)+50*51