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問:3√1除8.459 (取最大值)
答:
3√的意思是立方根 ( Cubic root ),即若 3√x = y ,那麼 y^3 = x。
而 (1/8.459)^(1/3),其實即是 3√(1/8.459) 的意思,意思其實一樣。至於要計算 3√1除8.459 的值,就要用上計算機囉!可參考
http://www.wolframalpha.com/input/?i=cubic+root+%281%2F8.459%29 ,3√1除8.459 就約等於 0.49078768681915268838275895652126399302956282225678398791367073843583816138274113597946119874011342722685834581216157533660272778004158386800208489869970300406327504615178548242022224904043621368509210160708848774115964283136790136711450105576783207879605429668758434536402593880828925837850492870706248557268845569204399074723194232595004455570310834624427050083219979154994896664348085545077979068937225039032101892582447132859029954701293784503936352142965821817673716549295014475663395906214973687478171794348077436419619927102188277706005565402475241441864400476039221307959393005024577686791978398581952003535926438516749598736264287837303006743535993633761968170231877574757117595992400358829348650542328818874990406526188037569438478135507355908216400960133825275997678213876867997216973277027452061428328714666956950730709342695884810340839406691970884219746765428342923926926564668906865193427818723244998873815430577 (要知道答案是不盡的),你說取最大值,應該是取最大值至小數點後三位,即4.901。
2011-07-21 17:07:23 補充:
根據指數律,x^(1/y) = y√x,所以 (1/8.459)^(1/3) = 3√(1/8.459)
2011-07-21 17:18:21 補充:
也可用代數向題主解釋:
假設
x = (1/8.459)^(1/3)
即
x^3 = [ (1/8.459)^(1/3) ]^3
根據整數指數律,
(x^m)^n = x^(m×n)
x^3 = [ (1/8.459)^(1/3) ]^3
x^3 = (1/8.459)^(3×1/3)
x^3 = (1/8.459)^1
x^3 = 1/8.459
3√(x^3) = 3√(1/8.459)
x = 3√(1/8.459)
由此證明(1/8.459)^(1/3) = 3√(1/8.459)
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