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在初中我们经常涉及到一种两元混合体系并且有平均值的计算题．它们在本质上都是根据某物理量在变化前后不变的特征来列式的．从而启发并帮助学生归纳出一种共同的方法“杠杆平衡”法．现将利用杠杆平衡法解题时，杠杆平衡模型的建立，各物理量的内涵及所得结果的含义简析如下
In junior high school, we often involve a two-way mixed system and have calculation problems on the average. In essence, they are based on the characteristics of a certain physical quantity before and after the change. Inspire and help students sum up a common method of “Leverage Balance” method. When the leverage balance method is used to solve the problem, the establishment of the leverage balance model, the connotation of each physical quantity and the meaning of the obtained results are briefly explained as follows: