19.已知函數(shù)f (x) =.. (1)證明函數(shù)y = f (x)的圖象關(guān)于點(diǎn)(a.-1)成中心對(duì)稱圖形, (2)當(dāng)x時(shí).求證:f (x). 查看更多

 

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已知函數(shù)f(x)=,g(x)=alnx,a∈R.
(Ⅰ)若曲線y=f(x)與曲線y=g(x)相交,且在交點(diǎn)處有相同的切線,求a的值及該切線的方程;
(Ⅱ)設(shè)函數(shù)h(x)=f(x)-g(x),當(dāng)h(x)存在最小值時(shí),求其最小值ψ(a)的解析式;
(Ⅲ)對(duì)(Ⅱ)中的ψ(a),證明:當(dāng)a∈(0,+∞)時(shí),ψ(a)≤1.

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(12分)已知函數(shù)f (x) =,.

    (1)證明函數(shù)y = f (x)的圖象關(guān)于點(diǎn)(a,-1)成中心對(duì)稱圖形;

    (2)當(dāng)x時(shí),求證:f (x).

 

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已知函數(shù)f(x),對(duì)任意x,y∈R,恒有f(x+y)=f(x)+f(y)成立,且當(dāng)x>0時(shí),,
(1)證明:f(x)是奇函數(shù);
(2)求f(x)在R上的解析式。

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(12分)已知函數(shù)f (x) =,.
(1)證明函數(shù)y = f (x)的圖象關(guān)于點(diǎn)(a,-1)成中心對(duì)稱圖形;
(2)當(dāng)x時(shí),求證:f (x).

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(12分)已知函數(shù)f (x) =,.
(1)證明函數(shù)y = f (x)的圖象關(guān)于點(diǎn)(a,-1)成中心對(duì)稱圖形;
(2)當(dāng)x時(shí),求證:f (x).

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