高效率的复习课在于选题的有效性,它能直接影响本节课的教学目标能否达成,也能够使得一节课的教学目标清晰明确.本文以高一数学“基本不等式”复习为例,就选题的策略和功能,谈一点自己教学实践.一、千里之行,始于足下——基础知识是基石例1求函数y=x+4/x的值域.分析当x>0时,4x>0,由基本不等式,得x+4/x≥4(当且仅当x=2时取等号), The high efficiency of the review class lies in the effectiveness of the selected topic, which can directly affect the teaching objectives of this lesson can be achieved, but also can make a class of teaching objectives clear and clear. In this paper, a higher mathematics “basic inequality ” review As an example, on the topic of the strategy and function, talk about their own teaching practice. A journey of thousands of miles, beginning with the footsteps - basic knowledge is the cornerstone Example 1 Find the value of the function y = x + 4 / x analysis. When x > 0, 4x> 0, from the basic inequality, we get x + 4 / x≥4 (if and only if x = 2, take the equal sign)