問題補充:單選題 與直線x-y-4=0和圓x2+y2+2x-2y=0都相切的半徑最小的圓的方程是?
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
答案:C
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