共50条信息
已知原点到直线\(l\)的距离为\(1\),圆\((\)\(x\)\(-2)^{2}+(\)\(y\)\(-\sqrt{5} )^{2}=4\)与直线\(l\)相切,则满足条件的直线\(l\)有( )
圆\({{x}^{2}}+{{y}^{2}}-2x+4y-4=0\)与\({{x}^{2}}+{{y}^{2}}+4x-4y-56=0\)的公切线条数为\((\) \()\)
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