11.下列判斷.正確的是 A.是函數(shù)f (x)為奇函數(shù)的充要條件 B.是函數(shù)f (x)為奇函數(shù)的必要非充分條件 C.設(shè)為正常數(shù)為奇函數(shù)的充要條件 D.設(shè)為正常數(shù)), 為奇函數(shù)的充要條件 查看更多

 

題目列表(包括答案和解析)

若函數(shù)解析式為yf(x),則下列判斷正確的是

A.若f(x)(-∞,0)(0,+∞)上均是增函數(shù),則f(x)(-∞,0)(0,+∞)上也是增函數(shù)

B.若f(x)(-∞,0)(0,+∞)上均是減函數(shù),則f(x)(-∞,0)(0,+∞)上也是減函數(shù)

C.若f(x)是偶函數(shù),且在(0,+∞)上是增函數(shù),則f(x)(-∞,0)上也是增函數(shù)

D.若f(x)是奇函數(shù),且在(0,+∞)上是增函數(shù),則f(x)(-∞,0)上也是增函數(shù)

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若函數(shù)解析式為yf(x),則下列判斷正確的是

A.若f(x)(-∞,0)(0,+∞)上均是增函數(shù),則f(x)(-∞,0)(0,+∞)上也是增函數(shù)

B.若f(x)(-∞,0)(0,+∞)上均是減函數(shù),則f(x)(-∞,0)(0,+∞)上也是減函數(shù)

C.若f(x)是偶函數(shù),且在(0,+∞)上是增函數(shù),則f(x)(-∞,0)上也是增函數(shù)

D.若f(x)是奇函數(shù),且在(0,+∞)上是增函數(shù),則f(x)(-∞,0)上也是增函數(shù)

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給出下列四個(gè)判斷:
①定義在R上的奇函數(shù)f(x),當(dāng)x>0時(shí)f(x)=x2+2,則函數(shù)f(x)的值域?yàn)閧y|y≥2或y≤-2};
②若不等式x3+x2+a<0對(duì)一切x∈[0,2]恒成立,則實(shí)數(shù)a的取值范圍是{a|a<-12};
③當(dāng)f(x)=log3x時(shí),對(duì)于函數(shù)f(x)定義域中任意的x1,x2(x1≠x2)都有f(
x1+x2
2
)<
f(x1)+f(x2)
2
;
④設(shè)g(x)表示不超過t>0的最大整數(shù),如:[2]=2,[1.25]=1,對(duì)于給定的n∈N+,定義
C
x
n
=
n(n-1)…(n-[x]+1)
x(x-1)…(x-[x]+1)
,x∈[1,+∞),則當(dāng)x∈[
3
2
,2)時(shí)函數(shù)
C
x
8
的值域是(4,
16
3
]
;
上述判斷中正確的結(jié)論的序號(hào)是
②④
②④

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設(shè)函數(shù)f(x)=a•sin(x+α1)+b•sin(x+α2),其中a,b,α1,α2為已知實(shí)常數(shù),下列關(guān)于函數(shù)f(x)的性質(zhì)判斷正確的命題的序號(hào)是
①②③
①②③

①若f(0)=f(
π
2
)=0
,則f(x)=0對(duì)任意實(shí)數(shù)x恒成立;
②若f(0)=0,則函數(shù)f(x)為奇函數(shù);
③若f(
π
2
)=0
,則函數(shù)f(x)為偶函數(shù).

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設(shè)函數(shù)f(x)=a•sin(x+α1)+b•sin(x+α2),其中a,b,α1,α2為已知實(shí)常數(shù),下列關(guān)于函數(shù)f(x)的性質(zhì)判斷正確的命題的序號(hào)是______.
①若f(0)=f(
π
2
)=0
,則f(x)=0對(duì)任意實(shí)數(shù)x恒成立;
②若f(0)=0,則函數(shù)f(x)為奇函數(shù);
③若f(
π
2
)=0
,則函數(shù)f(x)為偶函數(shù).

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