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设函数f(x)=,则满足f(x)=4的x的值是A.2B.16C.2或16D.-2或16
试题详情
设函数f(x)=
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIYAAAA3CAYAAADJ7zJBAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAWlSURBVHhe7Vy9leMgEFYXV8YFm7sTJ9uBytjE
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cQSSEGMaboJQt2EScI59N3e3YV6+tc8ZEUhCDKH4NMw3RoaRkaQfzwhFk1lFIB0xmH0Ybi+r0WA+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tQAAAABJRU5ErkJggg==
)
,则满足f(x)=4的x的值是( )
A.2
B.16
C.2或16
D.-2或16
相关试题
-
设函数f(x)=
,则满足f(x)=4的x的值是( )
A.2
B.16
C.2或16
D.-2或16
-
设函数f(x)=
,则满足f(x)=4的x的值是( )
A.2
B.16
C.2或16
D.-2或16
-
在△ABC中,已知A=30°,a=8,b=
,则△ABC的面积为( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAASCAYAAABM8m7ZAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEYSURBVEhL1VSxDcQgDPRcFIyTnk2oGYSWQVIw
ih+ThI8B+ymiSI8UKQlw57PPBnx4AQAuPQ/zVtKVtXZqBek88yfEOaC9auPSqC+5b91swKxkYFAs
YJdUJ3QNrLyXABg3XWw/jn2YBTdNtYwNmDNTkBwnzimx/RwsgqKaKVawubkopYqaKurHGdFc3b1G
TEpr//0g7jPSl3tGPMPmik8j2CDYh9V77jBRcYc99LFcw4zBumJFfWl9fMceB4hQw+QsDomI29lm
W4tGHSA37I6YVHXtVCApUlb6AkDfMcZK6A2g8Xt9l4k5NlSX3gZ7761mDDb8u5RX5YdqRqxgPzar
txIYqX59Vu/eIBj/PjGlmVS/rviy9SrxB0qnZrOSsUGpAAAAAElFTkSuQmCC
)
B.16
C.
或16
D.
或
-
在△ABC中,已知A=30°,a=8,b=
,则△ABC的面积为( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAASCAYAAABM8m7ZAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAEYSURBVEhL1VSxDcQgDPRcFIyTnk2oGYSWQVIw
ih+ThI8B+ymiSI8UKQlw57PPBnx4AQAuPQ/zVtKVtXZqBek88yfEOaC9auPSqC+5b91swKxkYFAs
YJdUJ3QNrLyXABg3XWw/jn2YBTdNtYwNmDNTkBwnzimx/RwsgqKaKVawubkopYqaKurHGdFc3b1G
TEpr//0g7jPSl3tGPMPmik8j2CDYh9V77jBRcYc99LFcw4zBumJFfWl9fMceB4hQw+QsDomI29lm
W4tGHSA37I6YVHXtVCApUlb6AkDfMcZK6A2g8Xt9l4k5NlSX3gZ7761mDDb8u5RX5YdqRqxgPzar
txIYqX59Vu/eIBj/PjGlmVS/rviy9SrxB0qnZrOSsUGpAAAAAElFTkSuQmCC
)
B.16
C.
或16
D.
或
-
一个三角形的直观图是腰长为4的等腰直角三角形,则它的原面积是( )
A.8
B.16
C.16![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
wlH6ZwRJ8ItklVSpQmn9picIg4+IsDT+iUf77R59XMz2zEB7xIw7x44e2nI+zrASZl5PxZG5OskN
0WtQdp+Ku0ClhFXnVsyWUKp45nyrH3ggjvDaokQnRIRgchtMJZRfs8fV8KVHpVUhhDR1iqDcluat
WBKu3ZIDe2iyPi0SweF+FUtA/SM58G98ZscV9xH28A1cNzenQMq9E8tF4v7KuVCsin81ApctPDAe
KwAAAABJRU5ErkJggg==
)
D.32
-
已知一个正方形的直观图是个平行四边形,其中一边长是2,则此正方形的面积是( )
A.4
B.16
C.4或16
D.都不对
-
已知实数x、y满足约束条件
,则z=2x+4y的最大值为( )
A.24
B.20
C.16
D.12
-
已知实数x,y满足x+2y=3,则2x+4y的最小值是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADgSURBVDhPzZQ7DsQgDER9LgqOk56bUHMQWh8k
BUeZjdkky9ciUopFihSkzGNsTyA8XESEpechN0NX1tpXBelPwOx+fbMBSam1czzRElKAdXyiGE6G
c+/7EyqwoqXEXDlMwYIU1yVY0/bDk9JWHbcFFdoOzI6gcNW4ldoaXPVsPMFp3BptAU4I1uEa4ywY
Y3CvvcHsLEKbs7idMdzuc0bgkTaDJQlVX48hyD7GmIHeEIzf83sLnmlJGt5fKk1LsvOv6xKsaZfv
iu34ccT163fF7g3I+PfB0gZx/brjKxar4A+441mfjclsNQAAAABJRU5ErkJggg==
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAASCAYAAABfJS4tAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADpSURBVDhPzZRBDoQgDEV7LhYcx31vwpqDsO1B
XHCUPxRRUBmDo4shMdGk/j6eRcLNRUQYum7m5tCRNVbVJP1bcIS3BJbvmz0RC1fn1iOWV3cqore5
aDg4etitWMD6YctzDU5F7OUWcRTZCBU0gxXqEpwUsG7jBxWtNdXSEgtb+CznWbBw1UhIXarTB8E7
3wBpl95JsssWTqs/xwrEaIfpcEAOxGEqTaetQS+4qqwcl8EhhFzpDMG4Od8fg3USduNZ1F4TrwCZ
fKFug/saFyXD/4opDb9Sv/6vmJ0BGfd+sGpQ6teJV92jwR8CbVbGFQ6FjwAAAABJRU5ErkJggg==
)
C.16
D.不存在
-
实数x,y满足x2+y2=4,则x2+8y+3的最大值是( )
A.12
B.19
C.16
D.23
-
已知正数x、y满足
,则x+2y的最小值是( )
A.18
B.16
C.8
D.10