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已知,则x2+y2-2x+4y+15的最大值为________.
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已知
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAAA/CAYAAABQHc7KAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAQnSURBVHhe7Vs9muMgDPUt9hhbTO+bpMkNfIr5
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UafPn26+UgEA/5Px4PwVAFd1/P1LvR1O+wrusVetjkiIyqYbMnUbVd/Oc9tejavZHgBFvD90KltH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)
,则x
2+y
2-2x+4y+15的最大值为________.
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已知
,则x2+y2-2x+4y+15的最大值为________.
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,则x2+y2-2x+4y+15的最大值为________.
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已知函数f ( x )=sinx-2x,若f(x2+y2+4x+2)≥0,则x2+y2+4y+2的最大值为( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
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WBKu3ZIDe2iyPi0SweF+FUtA/SM58G98ZscV9xH28A1cNzenQMq9E8tF4v7KuVCsin81ApctPDAe
KwAAAABJRU5ErkJggg==
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B.3![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
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C.12
D.16
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已知函数f ( x )=sinx-2x,若f(x2+y2+4x+2)≥0,则x2+y2+4y+2的最大值为( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
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KwAAAABJRU5ErkJggg==
)
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KwAAAABJRU5ErkJggg==
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实数x,y滿足x2+y2+2x-4y+1=0,
求(1)
的最大值和最小值;
(2)2x+y的最大值和最小值;
(3)
的最大值和最小值.
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若实数x,y满足x2+y2-2x+4y=0,则x-2y的最大值为________.
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若实数x,y满足x2+y2-2x+4y=0,则x-2y的最大值为________.
-
若实数x,y满足x2+y2-2x+4y=0,则x-2y的最大值为________.
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若实数x,y满足x2+y2-2x+4y=0,则x-2y的最大值为________.