有这样一些应用题,给出了两个或两个以上的未知数量间的关系,要求求出这些未知的数量。我们在解决问题时,可以通过比较条件,分析对应的未知数量变化情况,想办法消去其中的某一个未知量,从而把复杂的数量关系转化成比较简单的数量关系,最后解答出来。这样的解题方法,我们通常叫作“消元法”。【例】商场上午卖出4个足球和2个篮球,共收货款436.8元; There are some application questions that give the relationship between two or more unknown quantities and ask for these unknown quantities. When we solve the problem, we can analyze the change of the corresponding unknown quantity by comparing the conditions, and try to eliminate one of the unknowns so as to convert the complex quantitative relationship into a simple quantitative relation and finally solve the problem. This problem-solving method, we usually called “elimination method ”. [Example] shopping mall sold 4 football and 2 basketball in the morning, a total of 436.8 yuan received payment;