已知圆C:(x-3)²+(y-4)²=4,直线l1过定点A(1,0) 1.若l1与圆相切,求l1的方程;2.若l1与圆相交于p、q两点,线段pq的中点为m,又l1与l2:x+2y+2=0的交点为N,求证:|AM|*|AN|为定值
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![已知圆C:(x-3)²+(y-4)²=4,直线l1过定点A(1,0) 1.若l1与圆相切,求l1的方程;2.若l1与圆相交于p、q两点,线段pq的中点为m,又l1与l2:x+2y+2=0的交点为N,求证:|AM|*|AN|为定值](/uploads/image/z/6930167-23-7.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%86C%EF%BC%9A%EF%BC%88x-3%29%26%23178%3B%2B%EF%BC%88y-4%29%26%23178%3B%3D4%2C%E7%9B%B4%E7%BA%BFl1%E8%BF%87%E5%AE%9A%E7%82%B9A%EF%BC%881%2C0%EF%BC%89+1.%E8%8B%A5l1%E4%B8%8E%E5%9C%86%E7%9B%B8%E5%88%87%2C%E6%B1%82l1%E7%9A%84%E6%96%B9%E7%A8%8B%EF%BC%9B2.%E8%8B%A5l1%E4%B8%8E%E5%9C%86%E7%9B%B8%E4%BA%A4%E4%BA%8Ep%E3%80%81q%E4%B8%A4%E7%82%B9%2C%E7%BA%BF%E6%AE%B5pq%E7%9A%84%E4%B8%AD%E7%82%B9%E4%B8%BAm%2C%E5%8F%88l1%E4%B8%8El2%3Ax%2B2y%2B2%3D0%E7%9A%84%E4%BA%A4%E7%82%B9%E4%B8%BAN%2C%E6%B1%82%E8%AF%81%EF%BC%9A%7CAM%7C%2A%7CAN%7C%E4%B8%BA%E5%AE%9A%E5%80%BC)
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来源:学生作业帮助网 编辑:作业帮 时间:2024/08/05 10:44:03