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函数定义域为函数之根本,在解函数基本性质问题、函数实际问题时辨别函数的定义域是否影响解题结论或定义域的范围是否改变,对解题至关重要。
Function domain is the fundamental function of the function, the basic nature of the solution function, the actual function of the function to determine whether the definition of the domain function problem domain or the scope of the domain to change whether the problem is crucial.