題目列表(包括答案和解析)
對任意a∈[-1,1],函數(shù)f(x)=x2+(a-4)x+4-2a的值恒大于零,則x的取值范圍是 ( )
A.1<x<3 | B.x<1或x>3 |
C.1<x<2 | D.x<1或x>2 |
A.1<x<3 | B.x<1或x>3 |
C.1<x<2 | D.x<1或x>2 |
函數(shù)f (x) = x2+bx+c對任意實(shí)數(shù)t,都有f (2+t) = f (2-t),那么 ( )
(A) f (2)<f (1)<f (4) (B) f (1)<f (2)<f (4)
(C) f (2)<f (4)<f (1) (D) f (4)<f (2)<f (1)
(A) f (2)<f (1)<f (4) (B) f (1)<f (2)<f (4)
(C) f (2)<f (4)<f (1) (D) f (4)<f (2)<f (1)
函數(shù)f(x)的定義域?yàn)?i>D,若對于任意的x1、x2∈D,當(dāng)x1<x2時(shí),都有f(x1)≤f(x2),則稱函數(shù)f(x)在D上為非減函數(shù).設(shè)函數(shù)f(x)在[0,1]上為非減函數(shù),且滿足以下三個(gè)條件:①f(0)=0;②f=f(x);③f(1-x)=1-f(x).則f+f等于( )
A. B. C.1 D.
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