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要想搞清楚本題必須先搞清楚下麵的問題:1,函數f(x)與f(-x),f(2x+5)不是同一函數;2.函數f(x)與f(t),f(u)是同一函數;3,定義域永遠是指向引數x的;4,f(-x);f(2x+5)是f的複合函數,也稱為二代f令t=-xf(-x)=f(t)…
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