共50条信息
圆\(C_{1}\)：\((x+1)^{2}+(y+2)^{2}=4\)与圆\(C_{2}\)：\((x-1)^{2}+(y+1)^{2}=9\)有\((\) \()\)条公切线
在坐标平面内，与点\(A(1,2)\)的距离为\(1\)，且与点\(B(5,5)\)的距离为\(d\)的直线共有\(4\)条，则\(d\)的取值范围是 ( )
已知圆\(C_{1}:x^{2}+y^{2}=1\)，圆 \(C_{2}:x^{2}+y^{2}-8x+12=0\)，则两圆的公切线长为____ ___．
圆\(O_{1}\)：\(x\)\({\,\!}^{2}+\)\(y\)\({\,\!}^{2}-2\)\(x\)\(=0\)和圆\(O_{2}\)：\(x\)\({\,\!}^{2}+\)\(y\)\({\,\!}^{2}-4\)\(x\)\(=0\)的公切线有 条\(.\)
两圆\((x{-}2)^{2}{+}(y{-}1)^{2}{=}4\)与\((x{+}1)^{2}{+}(y{-}2)^{2}{=}9\)的公切线有\(({ })\)条\(.\)
两圆\((x-2)^{2}+(y-1)^{2}=4\)与\((x+1)^{2}+(y-2)^{2}=9\)的公切线有\((\) \()\)
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