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1个回答
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要使函数有意义必须:
{x≠0
{1+(1/x)≠0
{1+(1/x)>0
===>
{x≠0
{x≠-1
{(x+1)/x>0
===>
{x≠0
{x≠-1
{x(x+1)>0
===>
{x≠0
{x≠-1
{x>0或x<-1
===>
x>0或x<-1
{x≠0
{1+(1/x)≠0
{1+(1/x)>0
===>
{x≠0
{x≠-1
{(x+1)/x>0
===>
{x≠0
{x≠-1
{x(x+1)>0
===>
{x≠0
{x≠-1
{x>0或x<-1
===>
x>0或x<-1
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