题1:已知在上恒成立,则。这是一道填空小题,看上去十分简单,但是却难倒了不少学生。从他们的表现来看,有好多值得耐人寻味的地方。现从我们的教学实践来谈谈如何经过系列变式设计,引领学生对问题进行深入探究,使得他们既能对同类问题达到触类旁通之效,又能帮助他们把握问题的实质而跳出题海之果。一、方法上的探究解法1:学生对恒成立问题,常常使用分离变量的手段。所以好 Question 1: It is known that the constant on the establishment, then. This is a blank fill, it looks very simple, but it stumped a lot of students. From their point of view, there are many places worth considering. Now from our teaching practice to talk about how to go through a series of variant design, leading students to explore the issue in depth, so that they can not only reach the analogy of similar problems bypass effect, but also help them grasp the essence of the problem and jump out of the sea . First, the method of inquiry Solution 1: students on the establishment of the problem, often using the means of separation of variables. So good