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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解集求参数问题.
1The definition of the function domain is A and the function is constant in A. The two concepts are very similar. It is easy to mistakenly think that it is the same problem. In fact, A is always meaningful in A. The value of A is f(x). A subset of the domain of the definition is the inequality constant establishment problem; and A in the function definition domain A is the domain of the function, and its solution is the solution problem of the known inequality solution set.