21.設(shè)函數(shù)f(x)的定義域?yàn)閇-1.0)∪(0.1].且f(-x)=-f(x)恒成立.當(dāng)x∈(0.1)時(shí).f(x)=2ax-(a∈R). (1)求當(dāng)x∈[-1.0]時(shí).f(x)的解析式, (2)若f(x)在[-1.0]上為增函數(shù).求實(shí)數(shù)a的取值范圍, (3)若f(x)在區(qū)間[-1.0)上的最小值為12.求a的值. 查看更多

 

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設(shè)函數(shù)f(x)的定義域?yàn)閇-1,0]∪(0,1),且f(-x)=-f(x)恒成立,當(dāng)x∈(0,1)時(shí),f(x)=2ax-(a∈R).

(1)求當(dāng)x∈[-1,0]時(shí),f(x)的解析式;

(2)若f(x)在[-1,0]上為增函數(shù),求實(shí)數(shù)a的取值范圍;

(3)若f(x)在區(qū)間[-1,0)上的最小值為12,求a的值.

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設(shè)函數(shù)f (x)的定義域?yàn)?i>M,具有性質(zhì)P:對(duì)任意xM,都有f (x)+f (x+2)≤2f (x+1).

(1)若M為實(shí)數(shù)集R,是否存在函數(shù)f (x)=ax (a>0且a≠1,x∈R) 具有性質(zhì)P,并說明理由;

(2)若M為自然數(shù)集N,并滿足對(duì)任意xM,都有f (x)∈N. 記d(x)=f (x+1)-f (x).

(ⅰ) 求證:對(duì)任意xM,都有d(x+1)≤d(x)且d(x)≥0;

(ⅱ) 求證:存在整數(shù)0≤cd(1)及無窮多個(gè)正整數(shù)n,滿足d(n)=c.

 

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設(shè)函數(shù)f(x)的定義域?yàn)镽,若存在常數(shù)M>0,使|f(x)|≤M|x|對(duì)一切實(shí)數(shù)x均成立,則稱f(x)為“倍約束函數(shù)”.現(xiàn)給出下列函數(shù):①f(x)=2x;②f(x)=x2+1;

③f(x)=sinx+cosx;④f(x)=;⑤f(x)是定義在實(shí)數(shù)集R上的奇函數(shù),且對(duì)一切x1,x2均有|f(x1)-f(x2)|≤|x1+x2|.其中是“倍約束函數(shù)”的有________.

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設(shè)函數(shù)f (x)的定義域?yàn)?i>M,具有性質(zhì)P:對(duì)任意xM,都有f (x)+f (x+2)≤2f (x+1).
(1)若M為實(shí)數(shù)集R,是否存在函數(shù)f (x)=ax (a>0且a≠1,x∈R) 具有性質(zhì)P,并說明理由;
(2)若M為自然數(shù)集N,并滿足對(duì)任意xM,都有f (x)∈N. 記d(x)=f (x+1)-f (x).
(ⅰ) 求證:對(duì)任意xM,都有d(x+1)≤d(x)且d(x)≥0;
(ⅱ) 求證:存在整數(shù)0≤cd(1)及無窮多個(gè)正整數(shù)n,滿足d(n)=c.

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設(shè)函數(shù)f (x)的定義域?yàn)?i>M,具有性質(zhì)P:對(duì)任意xM,都有f (x)+f (x+2)≤2f (x+1).
(1)若M為實(shí)數(shù)集R,是否存在函數(shù)f (x)=ax (a>0且a≠1,x∈R) 具有性質(zhì)P,并說明理由;
(2)若M為自然數(shù)集N,并滿足對(duì)任意xM,都有f (x)∈N. 記d(x)=f (x+1)-f (x).
(ⅰ) 求證:對(duì)任意xM,都有d(x+1)≤d(x)且d(x)≥0;
(ⅱ) 求證:存在整數(shù)0≤cd(1)及無窮多個(gè)正整數(shù)n,滿足d(n)=c.

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