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一、函数定义域的求法1.如果只给出了解析式y=f(x),而没有指明它的定义域,那么函数的定义域就是指能使这个式子有意义的实数x的集合.此时,求函数的定义域的常见类型有: 当f(x)为整式结构时,其定义域为R; 当f(x)为分式结构时,其定义域为使分母不为0的x的集合; 当f(x)为二次根式结构(或n次根式中
First, the function of the domain definition method If you only give the analytical formula y = f (x), and did not specify its definition of the domain, then the definition of the domain of the function is to make the expression meaningful set of real x At this time, the common types of the function definition domain are: When f(x) is an integer structure, its domain is defined as R; When f(x) is a fractional structure, its definition domain is such that the denominator is not 0. a collection of x; when f(x) is a quadratic structure (or n times root)