论文部分内容阅读
例1已知函数f(x)=|x|/(x+2).(1)判断函数f(x)在区间(0,+∞)上的单调性,并加以证明;(2)如果关于x的方程f(x)=kx~2有四个不同的实数解,求实数k的取值范围。分析若用分类讨论法求解第(2)问,
(1) The monotonicity of the function f (x) over the interval (0, + ∞) is judged and proved; (2) If the function f The equation f (x) = kx ~ 2 for x has four different real numbers and finds the range of real numbers k. Analysis if the classification method to solve the first (2) asked,