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這個對數函數為單調遞增函數,所以求它的單調區間即求它的定義域:(1+x/1-x)>1,解它, (1+x/1-x)>1 (x/1-x)>0 等價於方程組x0. 分別解方程組,得到區間為空集或(0,1),綜合起來,所求區間就是(0,1)區間.
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