2-6应用支路电流法求题图2-6所示电路中的<img class=jc-formula data-tex=U,\quad I src=https://huaweicloudobs.ahjxjy.cn/51F63C0815B61995D6B5A1FC0777BB46.png style=vertical-align: middle;/>。<img src=https://huaweicloudobs.ahjxjy.cn/7A6CC50B5D209BF8E09320BB481188FC.png title=2-6.PNG alt=2-6.PNG/>
①
<img class=jc-formula data-tex=U=-7.5V,\quad I=-6.5A src=https://huaweicloudobs.ahjxjy.cn/A5EAEC7EFDF1BC56E9B8275D79B1EEB1.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=U=7.5V,\quad I=6.5A src=https://huaweicloudobs.ahjxjy.cn/060382F8FCEC502F37DD39463D0DE7BA.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=U=-7.5V,\quad I=6.5A src=https://huaweicloudobs.ahjxjy.cn/8CE5BA1383748E93BEDD039DDB0A2DFB.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=U=7.5V,\quad I=-6.5A src=https://huaweicloudobs.ahjxjy.cn/EE79853C4BB59C754DCABBAB13B51742.png style=vertical-align: middle;/>