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一般的科學型小算盘都有指數計算的功能(至少路邊地攤上那些老欧巴桑賣的10元錢左右的小算盘有此功能),財會用的小算盘上似乎沒有. 指數鍵的符號是[x^y],與開y次算術根的鍵在一起(作為第二功能). 計算3.5^(5/7)的值是,只需依此按下 3 .5 [x^y] ( 5 / 7 ) 即可.
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