有些较复杂的应用题,往往条件隐含,关系复杂,这时可以在直接设未知数的同时,再增设一个参数——辅助未知数,架起连结已知量与未知量的桥梁,以便理解各个量之间的关系,从而列出方程.这些辅助未知数一般可以在求解过程中消去.请看几例.例1某人沿河逆流而上,途中不慎将水壶失落,水 Some of the more complex applications, often with implied conditions and complex relationships, can be preceded by an unknown number, and an additional parameter—assisted unknowns—can be constructed to bridge the known quantity and the unknown quantity so that each quantity can be understood. The relationship between, and thus the listed equations. These auxiliary unknowns can generally be eliminated during the solution process. Look at a few examples. Example 1 Someone moves up the river and accidentally loses the water bottle on the way.