列方程(组)解应用题,关键是“设”和“列”.“设”,即设一个量(或两个量)(一般为所求量)为未知数x(或x,y),并把其他的未知量用x(或x,y)的代数式表示;“列”即分析数量关系,选择一个适当的相等关系,列出方程.由于考虑问题的角度不同,选择相等关系时,也可灵活多变,所列方程(组)差异也很大.本文例举说明之. 例1 某汽车从甲地到乙地,若每小时多走6千米,行完这段 Column equations (groups) solve the problem, the key is “set” and “column”. “Set”, that is set a quantity (or two quantities) (usually the quantity) is unknown x (or x, y), And other unknowns are represented by algebraic expressions of x (or x,y); “column” is the analysis of quantity relations, choosing a proper equality relation, and listing the equations. Because of the different perspectives of considerations, when choosing equal relations, Can be flexible, the listed equations (group) are also very different. This example illustrates. Example 1 A car from A to B, if you go 6 kilometers per hour, go through this paragraph