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具有“导数运算法则特征”的函数问题一般都是抽象函数,而且考查的角度相对隐蔽,一些同学无从下手,望“题”兴叹,如果运用构造函数的方法,问题将会迎刃而解。下面举例说明这类问题的解题策略。1.借助导数的加法或减法运算法则构造函数求解形如f′(x)±g′(x),可以构造h(x)=f(x)±g(x),至于f(x),g(x)是什么要看具体的问题而定。
Function problems with “Derivative Algorithm Feature ” are generally abstract functions, and the examination angle is relatively hidden, some students can not start, hope “” sigh, if you use the constructor method, the problem will be solved. The following examples illustrate the problem solving strategies for such issues. 1. Construct h (x) = f (x) ± g (x) with the help of the addition or subtraction of derivatives, and f (x), g (x) depends on the specific question.