用铝合金材料制成的,所有形状如图1所示的矩形窗框中,怎样的矩形窗框,在透光面积确定时,用料最省,在用料确定时,透光面积最大?在现实生活和生产实践中,我们经常会遇到这样的“双最”问题。“双最问题”种类多样,大部分涉及的量多、相互关系复杂,用初中数学知识难以解决,但在有的情况下运用配方法不但可以解决,而且快速简便。 Made of aluminum alloy, all the shapes shown in Figure 1 rectangular window frame, what kind of rectangular window frame, when the light transmission area is determined, the most materials used, the material used to determine the maximum light transmission area? In real life and production practice, we often encounter such a “double most” issue. “Double the most problematic ” variety, most of the volume involved, the relationship between complex, difficult to solve with junior high school mathematics, but in some cases the use of matching method not only can be solved, but also quick and easy.