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集合A應該是{y=x²;+2x|-2≤x≤2}吧 這樣A就表示區間[-1,8] 而B表示[-3,1] 這是一個幾何概型 概率=A交B區間的長度/A區間的長度=[-1,1]的長度/[-1,8]的長度=2/9
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