“水之形 ,避高而趋下” ,孙子从这一朴素的思想中总结出“兵之形 ,避实而击虚”的指导作战原则 .在解答物理问题时 ,总会遇到一些不易解决的问题 ,这时也要避实就虚 ,设法避开“实”点 .下面举例说明 .一、找准虚点 ,乘虚而入例 1　如图 1所示 ,已知电压表Ｖ1和Ｖ2的示数分别 “The shape of water, avoiding high and tending to the next,” Sun Tzu summed up the guiding principles of warfare “from the shape of the soldiers, avoiding the reality, and attacking the emptiness” from this simple idea. When answering physical questions, there are always some difficulties. Solve the problem, at this time we must also avoid the facts and try to avoid the “real” point. The following example illustrates. First, identify the virtual point, take the virtual into Example 1 as shown in Figure 1, known voltmeter V1 and V2 The number of indications are