导数的应用在高考中占有极其重要的地位,在利用导数证明不等式、求恒成立问题中的参数范围、处理方程根的个数、解决曲线图形等问题时,常需根据函数与方程思想,构造函数后再利用导数来求解,而构造差(和)函数 The application of derivatives in the college entrance examination occupies an extremely important position in the use of derivatives to prove inequalities, constitutive parameters in the establishment of the problem range, the number of roots to deal with the equation, to solve the problem of curve graphics, often according to the function and equation ideas, structure The function is then solved using derivatives to construct the difference (and) function