已知點(diǎn)P(2.1)在圓C:的對(duì) 稱(chēng)點(diǎn)也在圓C上.則實(shí)數(shù)a.b的值為 查看更多

 

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已知點(diǎn)P(2,1)在圓C:x2+y2+ax-2y+b=0上,點(diǎn)P關(guān)于直線(xiàn)x+y-1=0的對(duì)稱(chēng)點(diǎn)也在圓C上,則圓C的圓心坐標(biāo)為
 
,半徑為
 

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(2007•咸安區(qū)模擬)已知點(diǎn)P(2,1)在圓C:x2+y2+ax-2y+b=0上,點(diǎn)P關(guān)于直線(xiàn)x+y-1=0的對(duì)稱(chēng)點(diǎn)也在圓C上,則實(shí)數(shù)a,b的值為( 。

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已知點(diǎn)P(2,1)在圓C:x2+y2+ax-2y+b=0上,點(diǎn)P關(guān)于直線(xiàn)x+y-1=0的對(duì)稱(chēng)點(diǎn)也在圓C上,則圓C的圓心坐標(biāo)為    ,半徑為   

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已知點(diǎn)P(2,1)在圓C:x2+y2+ax-2y+b=0上,點(diǎn)P關(guān)于直線(xiàn)x+y-1=0的對(duì)稱(chēng)點(diǎn)也在圓C上,則圓C的圓心坐標(biāo)為_(kāi)_____,半徑為_(kāi)_____.

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已知點(diǎn)P(2,1)在圓C:x2+y2+ax-2y+b=0上,點(diǎn)P關(guān)于直線(xiàn)x+y-1=0的對(duì)稱(chēng)點(diǎn)也在圓C上,則實(shí)數(shù)a,b的值為( )
A.a(chǎn)=-3,b=3
B.a(chǎn)=0,b=-3
C.a(chǎn)=-1,b=-1
D.a(chǎn)=-2,b=1

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