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在高中数学教与学中,不少师生认为一次函数比较简单而忽视对它的深入复习,对其性质的应用潜能挖掘不够,造成了利用一次函数性质解题的功能被扼杀.本文试图通过几例来说明如何利用一次函数的性质解题.我们知道,一次函数f(x)=kx+b在任意一个区间上总是单调的,因此可得:性质一次函数f(x)=kx+b在区间[m,n]上恒大于某常数h的充要条件是f(m)>h,f(n)>h烅烄烆.对于恒小于某常数h的充要条件,也可同样给出.
In high school mathematics teaching and learning, many teachers and students think a simple function ignores its in-depth review of the application of its potential nature of mining is not enough, resulting in the use of a function of the nature of the problem solving function is strangled.This article attempts to pass Several examples are given to illustrate how to use the properties of a linear function to solve a problem. We know that the first-order function f (x) = kx + b is always monotonous in any interval, The necessary and sufficient condition that b is constant greater than a certain constant h in the interval [m, n] is f (m)> h and f (n)> h 烅 烄 烆. Given.