6、x>0}(D){x
7、x>1}3.若函數(shù)則f(f(10))=()(A)lg101(B)2(C)1(D)04.函數(shù)f(x)=+lg(3x+1)的定義域是( )(A
8、)(-,+∞)(B)(-,1)(C)(-,)(D)(-∞,-)5.已知g(x)=1-2x,f(g(x))=(x≠0),那么f()等于( )(A)15(B)1(C)3(D)306.給定函數(shù)①y=,②y=,③y=
9、x-1
10、,④y=2x+1,其中在區(qū)間(0,1)上是單調(diào)遞減的函數(shù)的序號是( )(A)①②(B)②③(C)③④(D)①④7.已知函數(shù)f(x)=單調(diào)遞減,那么實(shí)數(shù)a的取值范圍是( )(A)(0,1)(B)(0,)(C)[,)(D)[,1)8.若偶函數(shù)f(x)在(-∞,0)上單調(diào)遞減,則不等式f(-1)<f(lgx)的解集
11、是()(A)(0,10)(B)(,10)(C)(,+∞)(D)(0,)∪(10,+∞)9.已知定義在R上的函數(shù)f(x)是偶函數(shù),對x∈R都有f(2+x)=f(2-x),當(dāng)f(-3)=-2時(shí),f(2007)的值為( )(A)2(B)-2(C)4(D)-410.下列函數(shù)中,既是偶函數(shù),又在(0,1)上單調(diào)遞增的函數(shù)是( )(A)y=
12、log3x
13、(B)y=x3(C)y=e
14、x
15、(D)y=cos
16、x
17、11.方程lnx=6-2x的根必定屬于區(qū)間( )(A)(-2,1) (B)(,4)(C)(1,)(D)(,)12.若拋
18、物線y=x2在點(diǎn)(a,a2)處的切線與兩坐標(biāo)軸圍成的三角形的面積為16,則a=( )(A)4(B)±4(C)8(D)±8二.填空題(每小題5分,共20分)13.已知函數(shù)f(x)=3x+x-5的零點(diǎn)x0∈[a,b],且b-a=1,a,b∈N*,則a+b=_______.14.計(jì)算:= .15.函數(shù)y=loga(x-1)+2(a>0,且a≠1)的圖象恒過定點(diǎn) .16.已知函數(shù)f(x)=x3+ax2+bx-a2-7a在x=1處取得極大值10,則的值為———三.解答題(第17題10分,18-22各12分,共70分)17.已
19、知函數(shù)在處取得極值,并且它的圖象與直線在點(diǎn)(1,0)處相切,求a,b,c的值。18.已知集合,,(1)若,求;(2)若,求實(shí)數(shù)a的取值范圍.19.已知函數(shù),(1)若是奇函數(shù),求的值;(2)證明函數(shù)在R上是增函數(shù)。20.已知函數(shù)是定義在上的增函數(shù),對于任意的,都有,且滿足.(1)求的值;(2)求滿足的的取值范圍.21.已知函數(shù).(1)若函數(shù)有兩個(gè)零點(diǎn),求的取值范圍;(2)若函數(shù)在區(qū)間與上各有一個(gè)零點(diǎn),求的取值范圍.22.設(shè)函數(shù),曲線過P(1,0),且在P點(diǎn)處的切線斜率為2.(1)求a,b的值;(2)證明:2015屆高三第二次檢測文
20、科數(shù)學(xué)試卷答案18.略20.(1)取,得,則,取,得,則(2)由題意得,,故解得,21.22(1)由已知條件得,解得(2),由(1)知設(shè)則g/(x)=-1-2x+=-而9JWKffwvG#tYM*Jg&6a*CZ7H$dq8KqqfHVZFedswSyXTy#&QA9wkxFyeQ^!djs#XuyUP2kNXpRWXmA&UE9aQ@Gn8xp$R#͑Gx^Gjqv^$UE9wEwZ#Qc@UE%&qYp@Eh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8!z89AmYWpazadNu
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