(2)若函數(shù)有3個解.求實(shí)數(shù)的取值范圍. 查看更多

 

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若函數(shù)f(x)=ax3-bx+4,當(dāng)x=2時,函數(shù)f(x)有極值-
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(1)求函數(shù)的解析式;
(2)求函數(shù)的極值;
(3)若關(guān)于x的方程f(x)=k有三個零點(diǎn),求實(shí)數(shù)k的取值范圍.

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若函數(shù)f(x)=ax3-bx+4,當(dāng)x=2時,函數(shù)f(x)有極值,且函數(shù)f(x)圖象上以點(diǎn)A(3,f(3))為切點(diǎn)的切線與直線5x-y+1=0平行.
(I)求函數(shù)f(x)的解析式;
(II)以點(diǎn)A(3,f(3))為切點(diǎn)的切線方程;
(III)若方程f(x)=k有3個解,求實(shí)數(shù)k的取值范圍.

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若函數(shù),當(dāng)時,函數(shù)有極值,

(1)求函數(shù)的解析式;

(2)若函數(shù)有3個解,求實(shí)數(shù)的取值范圍.

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(14分)若函數(shù),當(dāng)時,函數(shù)有極值

(1)求函數(shù)的解析式;

(2)若函數(shù)有3個解,求實(shí)數(shù)的取值范圍.

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若函數(shù)f(x)=ax3-bx+4,當(dāng)x=2時,函數(shù)f(x)有極值為
(Ⅰ)求函數(shù)f(x)的解析式;
(Ⅱ)若f(x)=k有3個解,求實(shí)數(shù)k的取值范圍.

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