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“设而不求”在代数式的化简和计算、解析几何中有关中点、弦长等问题中的应用同学们是比较熟悉的,现在我们来讨论“设而不求”在导数应用中的运用.导数应用的所有问题都以研究导函数f′(x)的零点,即方程f′(x)=0的解为基础,当断定方程f′(x)=0有解,但其解不能求或不易求时,就需要利用“设而不求,整体代入”的方法继续进行问题的求解.
“Set and not seek ” In the algebraic simplification and calculation, analytic geometry on the midpoint, chord length and other issues in the application of the students are more familiar with, and now we talk about Derivative Applications All the problems of derivative applications are based on the solution of the zero point of the derivative function f ’(x), that is, the equation f’ (x) = 0, when the solution of the equation f ’(x) = 0 , But its solution can not seek or not easy to seek time, you need to use “set without seeking, the overall substitution ” method to continue to solve the problem.