1.已知1/m-1/n=2005,求分式m-mn-n/m-n
3个回答
因为1/m-1/n=2005
所以n-m/mn=2005
m-mn-n/m-n
=1-(mn/m-n)
=1+(mn/n-m)
=1+1/2005
=2006/2005
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