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沒錯,概率密度函數積分為1, 在這裏就是基本的積分公式 1/x的導數為 -1/x^2 所以 ∫(10,+∞) a/x^2 dx = -a/x (代入上限+∞和下限10) =10/x =1 於是 x=10
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