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反函數,顧名思義,就是把因變數和引數反著就行了. 例如y=1/x,很明顯反函數就是因變數y和引數x換一下x=1/y,為了習慣,我們寫成y=1/x當然定義域值域也要換,這裡定義域,值域一樣都是不等於0的 例如y=1/(x+1)的反函數 解y(x+1)=1 yx+y=1 yx=1-y x=(1-y)/y值域定義域都是不等與0 所以反函數為y=(1-x)/x x不等於0.
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