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函數分別在(負無窮,1),(1,正無窮)上單調增 所以直接代入定義域的端點即可 在(負無窮,1)區間上值域為(0,正無窮) 在[4,7)區間上值域為[-1,-1/2) 囙此總的值域為[-1,-1/2)U(0,正無窮) 另外,你寫的值域裏1那裡是開區間吧?就是不能取x=1的
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