首页
设a,b∈R,a2+2b2=6,则a+b的最小值是A.-2B.-C.-3D.-
试题详情
设a,b∈R,a
2+2b
2=6,则a+b的最小值是( )
A.-2
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
wlH6ZwRJ8ItklVSpQmn9picIg4+IsDT+iUf77R59XMz2zEB7xIw7x44e2nI+zrASZl5PxZG5OskN
0WtQdp+Ku0ClhFXnVsyWUKp45nyrH3ggjvDaokQnRIRgchtMJZRfs8fV8KVHpVUhhDR1iqDcluat
WBKu3ZIDe2iyPi0SweF+FUtA/SM58G98ZscV9xH28A1cNzenQMq9E8tF4v7KuVCsin81ApctPDAe
KwAAAABJRU5ErkJggg==
)
B.-
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAAkCAYAAABixKGjAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFfSURBVEhL3ZbLDYMwDIY9F4eMwz2bcM4gXDNI
DxnFzQvqvJ2WSrRISEjEX37/MTaAkxcAIOd2WJhkezD34q+MxPvBjRIvL4VC08i9UK7lK07qJCra
olFmL1q+pnAaZ5/teVBMgGuFqiU12yWBG5NkqGUBN6hELK+OHccerQP1ttZtCaFuZwDRzaKEE3E9
uNugpoA60yxFo1BYzwXxt6xzt+iwZ19jJawnv1fnubA6PKa377uHbgvgsj38c/cjcmVJrCngWlY8
9xkE9W248z6NBWuy9+poRq1yX+0ap57Ckw+vUgjs3vLYFoRl+17jcurv17i4PXpmnc2SN1lm1/nK
mlEyu/bf4fRDYw4Vpud2wpx9vpw2vXMYez6YNp/BaXTW9UbVM1YeCWFK2ftaz4m+yrS5zpZjDDIG
ObNaMm0TvrM9D1uESc+1fQynv2vZH9Vl1TIC1d6Plb9DjTG/C38CtHuquxe2S/gAAAAASUVORK5C
YII=
)
C.-3
D.-
相关试题
-
设a,b∈R,a2+2b2=6,则a+b的最小值是( )
A.-2![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
wlH6ZwRJ8ItklVSpQmn9picIg4+IsDT+iUf77R59XMz2zEB7xIw7x44e2nI+zrASZl5PxZG5OskN
0WtQdp+Ku0ClhFXnVsyWUKp45nyrH3ggjvDaokQnRIRgchtMJZRfs8fV8KVHpVUhhDR1iqDcluat
WBKu3ZIDe2iyPi0SweF+FUtA/SM58G98ZscV9xH28A1cNzenQMq9E8tF4v7KuVCsin81ApctPDAe
KwAAAABJRU5ErkJggg==
)
B.-![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAAkCAYAAABixKGjAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFfSURBVEhL3ZbLDYMwDIY9F4eMwz2bcM4gXDNI
DxnFzQvqvJ2WSrRISEjEX37/MTaAkxcAIOd2WJhkezD34q+MxPvBjRIvL4VC08i9UK7lK07qJCra
olFmL1q+pnAaZ5/teVBMgGuFqiU12yWBG5NkqGUBN6hELK+OHccerQP1ttZtCaFuZwDRzaKEE3E9
uNugpoA60yxFo1BYzwXxt6xzt+iwZ19jJawnv1fnubA6PKa377uHbgvgsj38c/cjcmVJrCngWlY8
9xkE9W248z6NBWuy9+poRq1yX+0ap57Ckw+vUgjs3vLYFoRl+17jcurv17i4PXpmnc2SN1lm1/nK
mlEyu/bf4fRDYw4Vpud2wpx9vpw2vXMYez6YNp/BaXTW9UbVM1YeCWFK2ftaz4m+yrS5zpZjDDIG
ObNaMm0TvrM9D1uESc+1fQynv2vZH9Vl1TIC1d6Plb9DjTG/C38CtHuquxe2S/gAAAAASUVORK5C
YII=
)
C.-3
D.-
-
设a,b∈R,a2+2b2=6,则a+b的最小值是( )
A.-2![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
wlH6ZwRJ8ItklVSpQmn9picIg4+IsDT+iUf77R59XMz2zEB7xIw7x44e2nI+zrASZl5PxZG5OskN
0WtQdp+Ku0ClhFXnVsyWUKp45nyrH3ggjvDaokQnRIRgchtMJZRfs8fV8KVHpVUhhDR1iqDcluat
WBKu3ZIDe2iyPi0SweF+FUtA/SM58G98ZscV9xH28A1cNzenQMq9E8tF4v7KuVCsin81ApctPDAe
KwAAAABJRU5ErkJggg==
)
B.-![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAAkCAYAAABixKGjAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFfSURBVEhL3ZbLDYMwDIY9F4eMwz2bcM4gXDNI
DxnFzQvqvJ2WSrRISEjEX37/MTaAkxcAIOd2WJhkezD34q+MxPvBjRIvL4VC08i9UK7lK07qJCra
olFmL1q+pnAaZ5/teVBMgGuFqiU12yWBG5NkqGUBN6hELK+OHccerQP1ttZtCaFuZwDRzaKEE3E9
uNugpoA60yxFo1BYzwXxt6xzt+iwZ19jJawnv1fnubA6PKa377uHbgvgsj38c/cjcmVJrCngWlY8
9xkE9W248z6NBWuy9+poRq1yX+0ap57Ckw+vUgjs3vLYFoRl+17jcurv17i4PXpmnc2SN1lm1/nK
mlEyu/bf4fRDYw4Vpud2wpx9vpw2vXMYez6YNp/BaXTW9UbVM1YeCWFK2ftaz4m+yrS5zpZjDDIG
ObNaMm0TvrM9D1uESc+1fQynv2vZH9Vl1TIC1d6Plb9DjTG/C38CtHuquxe2S/gAAAAASUVORK5C
YII=
)
C.-3
D.-
-
设a,b∈R,a2+2b2=6,则a+b的最小值是( )
A.-2![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
wlH6ZwRJ8ItklVSpQmn9picIg4+IsDT+iUf77R59XMz2zEB7xIw7x44e2nI+zrASZl5PxZG5OskN
0WtQdp+Ku0ClhFXnVsyWUKp45nyrH3ggjvDaokQnRIRgchtMJZRfs8fV8KVHpVUhhDR1iqDcluat
WBKu3ZIDe2iyPi0SweF+FUtA/SM58G98ZscV9xH28A1cNzenQMq9E8tF4v7KuVCsin81ApctPDAe
KwAAAABJRU5ErkJggg==
)
B.-![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAAkCAYAAABixKGjAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFfSURBVEhL3ZbLDYMwDIY9F4eMwz2bcM4gXDNI
DxnFzQvqvJ2WSrRISEjEX37/MTaAkxcAIOd2WJhkezD34q+MxPvBjRIvL4VC08i9UK7lK07qJCra
olFmL1q+pnAaZ5/teVBMgGuFqiU12yWBG5NkqGUBN6hELK+OHccerQP1ttZtCaFuZwDRzaKEE3E9
uNugpoA60yxFo1BYzwXxt6xzt+iwZ19jJawnv1fnubA6PKa377uHbgvgsj38c/cjcmVJrCngWlY8
9xkE9W248z6NBWuy9+poRq1yX+0ap57Ckw+vUgjs3vLYFoRl+17jcurv17i4PXpmnc2SN1lm1/nK
mlEyu/bf4fRDYw4Vpud2wpx9vpw2vXMYez6YNp/BaXTW9UbVM1YeCWFK2ftaz4m+yrS5zpZjDDIG
ObNaMm0TvrM9D1uESc+1fQynv2vZH9Vl1TIC1d6Plb9DjTG/C38CtHuquxe2S/gAAAAASUVORK5C
YII=
)
C.-3
D.-
-
设a,b∈R,a2+2b2=6,则a+b的最小值是( )
A.-2![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
wlH6ZwRJ8ItklVSpQmn9picIg4+IsDT+iUf77R59XMz2zEB7xIw7x44e2nI+zrASZl5PxZG5OskN
0WtQdp+Ku0ClhFXnVsyWUKp45nyrH3ggjvDaokQnRIRgchtMJZRfs8fV8KVHpVUhhDR1iqDcluat
WBKu3ZIDe2iyPi0SweF+FUtA/SM58G98ZscV9xH28A1cNzenQMq9E8tF4v7KuVCsin81ApctPDAe
KwAAAABJRU5ErkJggg==
)
B.-![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAAkCAYAAABixKGjAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFfSURBVEhL3ZbLDYMwDIY9F4eMwz2bcM4gXDNI
DxnFzQvqvJ2WSrRISEjEX37/MTaAkxcAIOd2WJhkezD34q+MxPvBjRIvL4VC08i9UK7lK07qJCra
olFmL1q+pnAaZ5/teVBMgGuFqiU12yWBG5NkqGUBN6hELK+OHccerQP1ttZtCaFuZwDRzaKEE3E9
uNugpoA60yxFo1BYzwXxt6xzt+iwZ19jJawnv1fnubA6PKa377uHbgvgsj38c/cjcmVJrCngWlY8
9xkE9W248z6NBWuy9+poRq1yX+0ap57Ckw+vUgjs3vLYFoRl+17jcurv17i4PXpmnc2SN1lm1/nK
mlEyu/bf4fRDYw4Vpud2wpx9vpw2vXMYez6YNp/BaXTW9UbVM1YeCWFK2ftaz4m+yrS5zpZjDDIG
ObNaMm0TvrM9D1uESc+1fQynv2vZH9Vl1TIC1d6Plb9DjTG/C38CtHuquxe2S/gAAAAASUVORK5C
YII=
)
C.-3
D.-
-
已知实数a,b,c满足ac2>bc2,则下列结论成立的是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAjCAYAAADmOUiuAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFlSURBVFhH7ZcLsoMgDEWzMvbEdtiMS2EpeQTE
PhFMUkHsjE6dsS2Yw70JH8CHX/BwPvxBQO/QgEHnb9BWEGuv4GIRAMJ9A6AwVsXiBe0dgNEgPtYL
eJ7Jr4JXK32ygmlGOJtqJwHyYFl5LWCcONOo6baLzkI5WHivMFaXpU4FphvztbV4JFgex1cK3gF2
CXDrzFap0s9K8yDGpyi451Y4qaLc+8v/Kd5XFl8F1ejaFXCE9UMAOdDFrmklmGiHAp5Z6Z0RLQST
AD06Y8N2lb/mANIyJ7D3UMVbbkAYHZ0ZhC/hddi3SPbSRmHNReOwdUZbFSTJAc12lEudx/ClWEAi
RO70vRUrApJyH7jcadDJrmIvxW8DUodS4tpvWh8b7Y/VSwq2xQDqcFSvVLQTXbSzqF4m12Fvb05c
GpHH8Ol7lfbGw/v5dAP7nS01/g/Zly/n+7YpEFThnHlQMe4XUCFWtenjFfwDFM15YfnEjdsAAAAA
SUVORK5CYII=
)
B.a2>b2
C.a3>b3
D.a2b>ab2
-
下列说法正确的是( )
A.a>b⇒ac2>bc2
B.a>b⇒a2>b2
C.a>b⇒a3>b3
D.a2>b2⇒a>b
-
已知实数a,b,c,d满足a+b+c+d=3,a2+2b2+4c2+4d2=5则a的最大值为( )
A.1
B.2
C.3
D..4
-
若a>1,则
的最小值是( )
A.2
B.a
C.3
D.
-
已知函数f(x)满足2f(x)-f(
)=
,则f(x)的最小值是( )
A.2
B.2![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
wlH6ZwRJ8ItklVSpQmn9picIg4+IsDT+iUf77R59XMz2zEB7xIw7x44e2nI+zrASZl5PxZG5OskN
0WtQdp+Ku0ClhFXnVsyWUKp45nyrH3ggjvDaokQnRIRgchtMJZRfs8fV8KVHpVUhhDR1iqDcluat
WBKu3ZIDe2iyPi0SweF+FUtA/SM58G98ZscV9xH28A1cNzenQMq9E8tF4v7KuVCsin81ApctPDAe
KwAAAABJRU5ErkJggg==
)
C.3
D.4
-
若a>1,则
的最小值是( )
A.2
B.a
C.3
D.