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函数都有值域.但并不是每个函数的值域都能求出来,而且对能求出其值域的函数来说,也不存在“万能”的“通法”.退而求其次.如果在求函数值域的诸方法中选一
Functions have ranges, but not all ranges of functions can be evaluated, and there is no “universal ” function for functions that can find their range. And seek second.If the function value range of the method to choose one