共50条信息
两圆\((x-2{)}^{2}+(y+1{)}^{2}=4 \)与\((x+2{)}^{2}+(y-2{)}^{2}=16 \)的公切线有\((\) \()\)
圆\({{(x+2)}^{2}}+{{y}^{2}}=4\)与圆\({{(x-2)}^{2}}+{{(y-1)}^{2}}=9\)的公切线的条数为( )
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