(1-2/1)+(2/1-3/1)+(3/1-4/1)+.+(2007/1-2008/1)这道题怎么做
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(1-2/1)+(2/1-3/1)+(3/1-4/1)+.+(2007/1-2008/1)这道题怎么做(1-2/1)+(2/1-3/1)+(3/1-4/1)+.+(2007/1-2008/1)这道题怎
(1-2/1)+(2/1-3/1)+(3/1-4/1)+.+(2007/1-2008/1)这道题怎么做
(1-2/1)+(2/1-3/1)+(3/1-4/1)+.+(2007/1-2008/1)这道题怎么做
(1-2/1)+(2/1-3/1)+(3/1-4/1)+.+(2007/1-2008/1)这道题怎么做
(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/2007-1/2008)
代开括号后,除1和1/2008以外,其他各项正负抵消
=1-1/2008
=2007/2008
(1-1/2)+(1/2-1/3)+(1/3-1/4)+。。。+(1/2007-1/2008)
代开括号后,除1和1/2008以外,其他各项正负抵消
=1-1/2008
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