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a>1時,考慮曲線y=a^x與y=x相切時,切點(x0,y0) dy/dx=lna.a^x=1,且a^x0=x0,得到lna=1/x0,a=e^(1/x0) a^x0=x0,a=x0^(1/x0),即e^(1/x0)=x0^(1/x0), x0>1,x^(1/x0)在x>0時為單調函數,得到x0=e 即此時的a=e^(1/e) 當1
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