函数、不等式和方程三者之间是相互联系的,通过化归与等价转化,往往可使复杂问题简单化,比如不等式问题可以转化为函数问题来解决,如果这个函数比较复杂,我们常常会用到导数,下面谈谈用导数处理不等式问题的常用策略.1分步多次求导例1证明:ln2(1+x)≤x21+x(x>-1).分析本题中函数由于出现二次的对数形式,所 Functions, inequalities, and equations are interrelated. Transformation and equivalence transformation often simplify complex problems. For example, inequalities can be transformed into function problems. If this function is complicated, we often will Use the derivative, the following talk about the commonly used strategy to deal with the problem of inequality with the derivative.1 Step by step multiple derivation Example 1 Proof: ln2 (1 + x) ≤ x21 + x (x> -1) The second logarithmic form, the