不对
应该是2/2008-1/2009-1/2007
如果中间是加号,则=1/2009-1/2007=-4016/4032063
|1/2009-1/2008|-|1/2008-1/2007| =1/2008-1/2009-1/2007+1/2008
2个回答
相关问题
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(1+1/2007+1/2008)*(1/2007+1/2008+1/2009)-(1+1/2007+1/2008+1/
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