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1函数的定义域为A与函数在A上恒有意义两个概念十分相似,易误认为是同一个问题,事实上“函数在A上恒有意义”中的A是f(x)的定义域的一个子集,是不等式恒成立问题;而“函数的定义域为A”中的A是函数的定义域,其解法是已知不等式的解集求参数问题.例1(1)已知函数f(x)=1+2x+3xa的
1 The definition of the function domain A is very similar to the concept that the function is constant on A. It is easy to mistakenly believe that it is the same problem. In fact, A is the definition of f(x). A subset of domains is an inequality asymptotic problem; and A in the “function definition domain A” is the domain of the function whose solution is the solution set of a known inequality for a parameter problem. Example 1(1) Known The function f(x)=1+2x+3xa