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给出下列四个函数:①②y=3x+3-x③④其中最小值为2的函数是________.
试题详情
给出下列四个函数:
①
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFcAAAAjCAYAAADhe5a7AAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
②y=3
x+3
-x③
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGgAAAAsCAYAAACJ1f3bAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
④
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKYAAAAjCAYAAAAe9XEcAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
其中最小值为2的函数是________.
相关试题
-
给出下列四个函数:
①
②y=3x+3-x③
④![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKYAAAAjCAYAAAAe9XEcAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAQlSURBVHhe7VuLcawwDKQymkkFTLqhGZdCKY7/
Fvgnnz9HQJnJTO7BGWu9lleL3sLphxC4IQLLDedEUyIEOBGTSHBLBIiYuWU5dr4uK9+PW67doydF
xEwtL9v4sizil4j5jR1AxMyizvhGxPwGL0lj5lEnYrazUmIoT57wd81oJMqYlDHbuZcZgW0bZ+L6
sW9aq0vdvu68JNuJmETMocS0g7PNaHWp3YmYrZjTUd6KoP7+wfdVZ04uibmpv7I/lDEpY5Y40n5d
2W72SF//AzHlTlp4TgS3o9IywoMzJjJztaDns6UofMzxfeyCmOZvtu/qFnfMg4d9OWPemJhql/tK
EnH6tK/hrBGiOk+vhaqeERoQPVWDo0s+AFePqX42xBhNzFi5n/o39KRH3ijAfxSZipIjbskEGCSq
Yrb5k0tltengnU8nNDFHcmjI2G8hpnpDZQoLBJCSgCHnrpLlSxIGyItFTjRI38iSHoGD0RBwNwMQ
TVp3QLnP4FiBKNrXhO6oMeZt7Oj578RExSrjx5NSqLn4/cF6h0crdq2b7gNFks6YkWYFKUyPpqeY
L8uxAbkOMS5zz9SEVZdPms54XtEmCgmavB6C7DZZ9E1DzQL2CLzHGOlYzY6vKxwTCQcWJLBgmV+U
+g1hjvIwle+X10Ufa0xLuKhm0RnPX4p9DpsoFJClTBHJmDUxtNzbg5J2jGysrtEkri/dpnc5wlfE
cI4jiVnC8YyVL4YBMT1BXFbrhTDMhieCYogZ0USY11o3O8rtAlVDmotVxFiT1UICmtlUHuUfx1IM
PiAm0BQCiG1UA+LVOlCap5QxQ2IykTGLfZIPIWY+1kqNmaodgLbT3MkXP6OJKXOXyZiWqYKUPT0s
oyV3JSqNepGkcsSvJ6bc9XLirrpMEbCKmHP8VLmgNT+oWKuq8jThau2i2lhwcfuN5pDShcOAAuFi
VHt/DFTequfx+hm2S63890frKEdqq6+6+G3jiVmzkLaIw8eabi27whO3i1QGQRvsNbE4QkI9nEp+
0C6yX+xWheO2xqvu+mghRyEUHNt1D/oolpMzYzZR6Pwbt0XPZznMTumSeOpipLu/hUBnn7oUxsHY
yXpMuQCnV5Jv+z8tZ6/TSBdo9OdMfpTpXVqmm1y/+MtTZ3VpIInJizo1PnX2Ax4WM/thU4Ew/33j
RsrkL5jeA6b9tCHTOtdH+j5iyrdCgW6B7kDZ5EcZ/E9jU694kJn6XcRUxSfIio6gJWJevFSMwd9r
IR81DuhkL8T1PmJaQE5mfx0xUQb/owjVJ5hYQ3Bq5HcRU5AxbvbjiYkyvfus46NGsbi5oAovQF5H
TNiVrrUmNPZhM4TtYDo3SOBN70fxqimYeNdX/mXOu4jZBC99eSYCRMyZaNOz0AgQMdFQ0Y0zESBi
zkSbnoVG4A/umxJBJGWZJwAAAABJRU5ErkJggg==
)
其中最小值为2的函数是________.
-
给出下列四个命题
(1)“k=1”是“函数y=cos2kx-sin2kx的最小正周期为π”的充要条件;
(2)“a=3”是“直线ax+2y+3a=0与直线3x+(a-1)y=a-7互相平行”的充要条件;
(3)函数
的最小值为2;
(4)双曲线
的两条渐近线是
.
其中是假命题为________(将你认为是假命题的序号都填上)
-
给出下列四个命题
(1)“k=1”是“函数y=cos2kx-sin2kx的最小正周期为π”的充要条件;
(2)“a=3”是“直线ax+2y+3a=0与直线3x+(a-1)y=a-7互相平行”的充要条件;
(3)函数
的最小值为2;
(4)双曲线
的两条渐近线是
.
其中是假命题为________(将你认为是假命题的序号都填上)
-
函数f(x)=x3-3x2,给出下列命题
(1)f(x)是增函数,无极值;
(2)f(x)是减函数,无极值
(3)f‘(x)的增区间为(-∞,o]及[2,+∞),减区间为[0,2];
(4)f(0)=0 是极大值,f(2)=-4是极小值.
其中正确的命题个数是( )
A.1
B.2
C.3
D.4
-
已知函数f(x)=x3-3x2,给出下列命题:
(1)f(x)是增函数,无极值;
(2)f(x)是减函数,无极值;
(3)f(x)的递增区间是(-∞,0),(2,+∞);
(4)f(0)=0是极大值,f(2)=-4是极小值.
其中正确命题是________(注:把你认为正确命题的序号都填上)
-
给出下列四个命题:
(1)函数y=ax(a>0且a≠1)与函数
(a>0且a≠1)的定义域相同;
(2)函数y=x3与y=3x的值域相同;
(3)函数
的单调递增区间为(-∞,2];
(4)函数
与
都是奇函数.
其中正确命题的序号是________(把你认为正确的命题序号都填上).
-
给出下列四种说法:
①函数y=ax(a>0且a≠1)与函数y=logaax(a>0且a≠1)的定义域相同;
②函数y=x3与y=3x的值域相同;
③函数y=
+
与y=
都是奇函数;
④函数y=(x-1)2与y=2x-1在区间[0,+∞)上都是增函数.
其中正确的序号是________(把你认为正确叙述的序号都填上).
-
给出下列四种说法:
①函数y=ax(a>0且a≠1)与函数y=logaax(a>0且a≠1)的定义域相同;
②函数y=x3与y=3x的值域相同;
③函数y=
+
与y=
都是奇函数;
④函数y=(x-1)2与y=2x-1在区间[0,+∞)上都是增函数.
其中正确的序号是________(把你认为正确叙述的序号都填上).
-
在给出的四个函数y=3x,y=x3,y=3x,y=log3x中,当x∈(3,+∞)时,其中增长速度最快的函数是( )
A.y=3
B.y=x3
C.y=3x
D.y=log3
-
给出下列命题:
(1)函数y=x+
的最小值是2;
(2)函数y=x+2
-3的最小值是-2;
(3)函数
的最小值是
;
(4)函数y=
在(-∞,0)∪(0,+∞)内递减;
(5)幂函数y=x3为奇函数且在(-∞,0)内单调递增;
其中真命题的序号有:________(把你认为正确的命题的序号都填上)