股票連續兩天漲停(+7%)又連續兩天跌停(-7%),求這四天的平均成長率。
本以為是很簡單的題目,學生講義上的類題,算式寫出來是
[(1.07)(1.07)(0.93)(0.93)]^(1/4) - 1
= [(1.07)(0.93)]^(1/2) - 1
通常這種題目根號裡面都可以質因數分解開出來,
不過這題好像沒辦法手算......
答案印象中是寫近似值 -0.25
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當思緒釐清
才發現當時的自己
真是 傻的可以......
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