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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
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAVeSURBVHhe7Zy5deMwEIbVxZaxgXN14sQdsAwn
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+2JZvCqBMFgUDPCE8Tt+/P0zvr3f1DbzqjjC4GjBaBxh/HzdhDC+//2qPcyrsokw7v1V/O7a38X2
0F3Gy7Uf5RZzRraLGPd+vJIYBhJJN6h9zGnZcCm5j/11ihrMudk0x8ASwtHiOdhQGANFDMo1WlfG
0LVvo2LoruNRAThPGHAqHRfFSy6HrhsHlWfc6d++Rd/D/haT4lm/yuX5CB2nCwODbiwcxg6doG19
RSIPyY7Udb6yJVIch2rRqs1mmPHrBPbVjxzJwrgPJAL1NxCCONrRYqZRpFKbS7Sa/yT59YDlrzzH
2NtYHV6Nk9RscrbTRJF37oS4H4M29W8xu8W2LLt0P+ZX0W6+/WsoFkadGYilCWE0MrDkwORLYzjb
m4XToEcKOubUT+1TDgVh2m3ukRzG/Vo/1ygThrMu7ovMYSKzRUeUhaJNLFn2RDKt/haI9rx95Idu
S2XM+rX+PaICYcDIsrCmBywLOCs2qBkRo0QY9753+igiTDBodIkesaGon4t+PYEw1oTPEofhFvs1
mpVn5A2RpeQhtvBEtCAbelpOrAbnfFHUz0W/Nr6UYOY5xpHDco3NcZhuz6y7fntiwFLEARHlC1ou
Y3KQdbt2brLU95J+GgK/liXPa0gWRjxZyzMWv0lBt+XOWNoXHQk4zbZpKvbpRlwVQNupJPkV/a9l
vCJZGGtBvYdS6ZJv+35iGcmPdmupJowmwMzLzTUOpX5uoXGE8f35IYTx1C/2VbzUXkvN5c/HEcbt
/e34kM80gVGBfhH4aZcRJgsljB8hCn47nNFcdKRgSTA2ImLoqxEWB6MxOQaLg7GxLkH480RmwhLG
i9zHYJJwhPH0dz6ZZDKFIW/R4pyT3DyswwEPubZg6VF/QcSAOOo+Am4a//mLfhKM0vxzmflnMfnC
ONGzhnLSHuULX9iD7/hG1bG1r0h421YZf1clWxh4qaTmK2bVETM+LSL6D7mqfGKxuTAI9NmrtCDH
8NU15R0ogWjs0GrKg/cL9G+MU9XsW+vkh/ViO3WZTDg34vDVUJ2zVYp3TuBfKo5irf1UgjESx92+
5AkjFjrp/MkGVzjy1ThLBBED5tF15QxWCgv1ktOToyEG/YFQt3psHn/LSxfdB7s/arKicX/Mosjz
bVvzhOHMgLAyMDlDHnccnSUMnA5hbSkKyWy96F/geLfo/j5cJtBX3zlbMBcxAlFDKGTzQ1GAcKyy
hOHMgOiMgTE6QoSN4ffJMxIkqF0PWBZz9QbOnWdZGOj7sqCL7AbJwlA2Jr0EvUoYbuhFo1FDbGeJ
CDHNtixREPOfDkyUOHjvTxJSPrEosVswJwwvGuvxkeJ41CcpDLvedGHAEfTLe9/JTqttTVyd5Oho
LxSoQznISZYI1IddJkrNOYTIcfDDeoVNKeKwo+OErt+wkd2Ghfqk7eEklGOj/Owdk4QTIlkYunK7
UjjXNBiZPbZBgTH2GqwiC87RdZrzdWdnvIFjKeTVC0fJ8/1in27EpXD8YUpcZDjWDPCF54dkYeQC
J9li8IW1xTX/4c71wncqTYlCLCNh5NtHGGI2RhwWUaYBxzKF0QRntVsQ5haaXSMG6nLKnCgIRAw7
wpwKe1k8Ef5SaLObMPKgNf20s+45aUIYwf9FwRzO4cLAEnLCKPz0HCsMStycvIK2WSRt4AhDf2Py
8fmt9uyHfY9jKryktIIjDMAvBDMgEAZgcTBRYQD+dPGVGcf/GdhLnIiZUBIAAAAASUVORK5CYII=
)
,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