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一、填空题1.(安徽中考题)圆心都在x轴上的两圆有一个公共点(1,2),那么这两圆的公切线有( ) A 1条B.2条C.3条D.4条2.(北京丰台区中考题)如果两圆的半径分别为3和4,圆心距为7,那么这两个圆的位置关系是( ) A.外切B.内切C.相交D.外离3.(北京西城区中考题)两圆既有外公切线、又有内公切线,则两圆的位置关系是( ) A.外离B.外离、外切
First, fill in the blank question 1. (Anhui exam questions) two circles on the x-axis have a common point (1,2), then the public tangent lines of the two circles () A 1 B.2 C.3 Article D.4 Article 2. (Beijing Fengtai District Examination Questions) If the radius of the two circles is 3 and 4, respectively, and the circle center distance is 7, then the position relationship between these two circles is () A. Exocution B. Inset C .Intersection D. Outliers 3. (Beijing Xicheng District Examination Questions) The two circles have both the grandfather tangent and the male tangent, so the positional relationship of the two circles is () A. Outside the B. Outside, outside