求最值问题的两种构造方法安徽师范大学附中袁金在求解有关最值问题时，有一种较常规的方法，就是构造法．具体到构造的模式有两种．１．估计＋构造这种方法是先对所给问题进行恰当的估计，得出形如ｆ≥ｃ（或ｆ≤ｃ）的式子，然后构造出ｆ＝ｃ的实例．例１设ｘ、ｙ、ｚ为... Two construction methods to find the most value problem Yuan Jin, the middle school teacher at Anhui Normal University, has a more conventional method to solve the problem of the most value, that is, the construction method. There are two specific modes of construction. 1. The method of estimating + constructing this method is to estimate the given problem properly and obtain an expression of the form f ≥ c (or f ≤ c), and construct an instance of f = c. Example 1 Let x, y, and z be...