解法三:原函數(shù)f (x)=log5(x2+1)經(jīng)過(guò)點(diǎn)(2.1).反函數(shù)y=g (x)經(jīng)過(guò)點(diǎn)點(diǎn)代入排除A. B.又原函數(shù)中y≥1.從而反函數(shù)中x≥1.排除 C.故選D. 學(xué)科網(wǎng)16 若函數(shù)y=log2|ax-1|的圖象的對(duì)稱軸為x=2.則非零實(shí)數(shù)a的值是( ) 查看更多

 

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對(duì)于三次函數(shù)f(x)=ax3+bx2+cx+d(a≠0),給出定義:設(shè)f′(x)是函數(shù)f(x)的導(dǎo)數(shù),f″(x)是函數(shù)f′(x)的導(dǎo)數(shù),f″(x)是函數(shù)f(x)的導(dǎo)數(shù),此時(shí),稱f″(x)為原函數(shù)f(x)的二階導(dǎo)數(shù).若二階導(dǎo)數(shù)所對(duì)應(yīng)的方程f''(x)=0有實(shí)數(shù)解x0,則稱點(diǎn)(x0,f(x0))為函數(shù)f(x)的“拐點(diǎn)”.某同學(xué)經(jīng)過(guò)探究發(fā)現(xiàn):任何一個(gè)三次函數(shù)都有“拐點(diǎn)”;任何一個(gè)三次函數(shù)都有對(duì)稱中心,且“拐點(diǎn)”就是對(duì)稱中心.
設(shè)三次函數(shù)f(x)=2x3-3x2-24x+12請(qǐng)你根據(jù)上面探究結(jié)果,解答以下問(wèn)題:
①函數(shù)f(x)=2x3-3x2-24x+12的對(duì)稱中心坐標(biāo)為
(
1
2
,-
1
2
)
(
1
2
,-
1
2
)
;
②計(jì)算f(
1
2013
)+f(
2
2013
)+f(
3
2013
)+…+f(
2012
2013
)+f(
2013
2013
)
=
-1019
-1019

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對(duì)于三次函數(shù)f(x)=ax3+bx2+cx+d(a≠0),給出定義:設(shè)f′(x)是函數(shù)f(x)的導(dǎo)數(shù),f″(x)是函數(shù)f′(x)的導(dǎo)數(shù),f″(x)是函數(shù)f(x)的導(dǎo)數(shù),此時(shí),稱f″(x)為原函數(shù)f(x)的二階導(dǎo)數(shù).若二階導(dǎo)數(shù)所對(duì)應(yīng)的方程f''(x)=0有實(shí)數(shù)解x0,則稱點(diǎn)(x0,f(x0))為函數(shù)f(x)的“拐點(diǎn)”.某同學(xué)經(jīng)過(guò)探究發(fā)現(xiàn):任何一個(gè)三次函數(shù)都有“拐點(diǎn)”;任何一個(gè)三次函數(shù)都有對(duì)稱中心,且“拐點(diǎn)”就是對(duì)稱中心.
設(shè)三次函數(shù)f(x)=2x3-3x2-24x+12請(qǐng)你根據(jù)上面探究結(jié)果,解答以下問(wèn)題:
①函數(shù)f(x)=2x3-3x2-24x+12的對(duì)稱中心坐標(biāo)為_(kāi)_____;
②計(jì)算f(
1
2013
)+f(
2
2013
)+f(
3
2013
)+…+f(
2012
2013
)+f(
2013
2013
)
=______.

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對(duì)于三次函數(shù)f(x)=ax3+bx2+cx+d(a≠0),給出定義:設(shè)f′(x)是函數(shù)f(x)的導(dǎo)數(shù),f″(x)是函數(shù)f′(x)的導(dǎo)數(shù),f″(x)是函數(shù)f(x)的導(dǎo)數(shù),此時(shí),稱f″(x)為原函數(shù)f(x)的二階導(dǎo)數(shù).若二階導(dǎo)數(shù)所對(duì)應(yīng)的方程f''(x)=0有實(shí)數(shù)解x,則稱點(diǎn)(x,f(x))為函數(shù)f(x)的“拐點(diǎn)”.某同學(xué)經(jīng)過(guò)探究發(fā)現(xiàn):任何一個(gè)三次函數(shù)都有“拐點(diǎn)”;任何一個(gè)三次函數(shù)都有對(duì)稱中心,且“拐點(diǎn)”就是對(duì)稱中心.
設(shè)三次函數(shù)f(x)=2x3-3x2-24x+12請(qǐng)你根據(jù)上面探究結(jié)果,解答以下問(wèn)題:
①函數(shù)f(x)=2x3-3x2-24x+12的對(duì)稱中心坐標(biāo)為    ;
②計(jì)算=   

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(2013•懷化三模)函數(shù)f(x)=
3
2
sinx+
1
2
cosx的一條對(duì)稱軸是(  )

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(2012•濟(jì)南三模)函數(shù)f(x)=2sin(ωx+φ)的圖象,其部分圖象如圖所示,則f(0)=
-
2
-
2

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