又∵P(1.m)在f(x)的圖像上.∴ ??????????????????6分 (2)∵函數(shù)f(x)在(1.2)內(nèi)是增函數(shù) ??????????????????7分 查看更多

 

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(本小題滿分12分)函數(shù)f(x)=ax2-2(a-1)x-2lnx ,a>0

(1)求函數(shù)f(x)的單調(diào)區(qū)間;

(2)對(duì)于函數(shù)圖像上的不同兩點(diǎn)A(x1,y1),B(x2,y2),如果在函數(shù)圖像上存在點(diǎn)P(x0,y0)(其中x0在x1與x2之間),使得點(diǎn)P處的切線l平行于直線AB,則稱AB存在“伴隨切線”,當(dāng)x0=  時(shí),又稱AB存在“中值伴隨切線”.試問(wèn):在函數(shù)f(x)的圖像上是否存在不同兩點(diǎn)A,B,使得AB存在“中值伴隨切線”?若存在,求出A,B的坐標(biāo);若不存在,說(shuō)明理由

 

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若直角坐標(biāo)平面內(nèi)的兩點(diǎn)P,Q滿足條件:①P,Q都在函數(shù)yf(x)的圖像上;②P,Q關(guān)于原點(diǎn)對(duì)稱.則稱點(diǎn)對(duì)[PQ]是函數(shù)yf(x)的一對(duì)“友好點(diǎn)對(duì)”(點(diǎn)對(duì)[P,Q]與[Q,P]看作同一對(duì)“友好點(diǎn)對(duì)”).已知函數(shù)f(x)=則此函數(shù)的“友好點(diǎn)對(duì)”有                                      (  )

A.0對(duì)                             B.1對(duì)

C.2對(duì)                             D.3對(duì)

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若直角坐標(biāo)平面內(nèi)的兩點(diǎn)P、Q滿足①P、Q都在函數(shù)y=f(x)的圖像上;②P、Q關(guān)于原點(diǎn)對(duì)稱,則稱點(diǎn)對(duì)[P,Q]是函數(shù)y=f(x)的一對(duì)“友好點(diǎn)對(duì)”(注:點(diǎn)對(duì)[P,Q]與[Q,P]看作同一對(duì)“友好點(diǎn)對(duì)”).

已知函數(shù)f(x)=則此函數(shù)的“友好點(diǎn)對(duì)”有(  )

A.0對(duì)    B.1對(duì)

C.2對(duì)    D.3對(duì)

 

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(07年北師大附中)  已知函數(shù)f (x ) = x4-4x3 + ax2-1在區(qū)間[0,1]單調(diào)遞增,在區(qū)間[1,2單調(diào)遞減.

(1)求a的值;

(2)若點(diǎn)A (x0,f (x0))在函數(shù)f (x )的圖像上,求證點(diǎn)A關(guān)于直線x = 1的對(duì)稱點(diǎn)B也在函數(shù)f (x )的圖像上;

(3)是否存在實(shí)數(shù)b,使得函數(shù)g (x ) = bx2-1的圖像與函數(shù)f (x )的圖像恰有3個(gè)交點(diǎn),若存在,請(qǐng)求出實(shí)數(shù)b的值;若不存在,試說(shuō)明理由.

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 若直角坐標(biāo)平面內(nèi)M、N兩點(diǎn)滿足:

①點(diǎn)M、N都在函數(shù)f(x)的圖像上;

②點(diǎn)M、N關(guān)于原點(diǎn)對(duì)稱,則稱這兩點(diǎn)M、N是函數(shù)f(x)的一對(duì)“靚點(diǎn)”.

已知函數(shù)則函數(shù)f(x)有           對(duì)“靚點(diǎn)”.

 

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