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)
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