设<img class=jc-formula data-tex=f\left( x \right) =\frac { 1+{ e }^{ \frac { 1 }{ x } } }{ 2+3{ e }^{ \frac { 1 }{ x } } } src=https://huaweicloudobs.ahjxjy.cn/FAC0143D01194DDC1349216699EF2484.png style=vertical-align: middle;/>,则x=0是<img class=jc-formula data-tex=f\left( x \right) src=https://huaweicloudobs.ahjxjy.cn/FB6E53A56CB8DA138AA7D1A4EBCF7519.png style=vertical-align: middle;/>的()