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与直线x-y-4=0和圆x2+y2+2x-2y=0都相切的半径最小的圆的方程是(...
与直线x-y-4=0和圆x2+y2+2x-2y=0都相切的半径最小的圆的方程是( )
A.(x+1)2+(y+1)2=2
B.(x+1)2+(y+1)2=4
C.(x-1)2+(y+1)2=2
D.(x-1)2+(y+1)=4
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