如图所示电路，以下结点电压方程中错误的是：<br/> <img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/1af546941008439fb5430c5a719d5646.jpeg?x-oss-process=image/sharpen,200"/><img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/20ec09a860a7491a8a2ade2292131e70.jpeg?x-oss-process=image/sharpen,200"/>