圆x²+y²+2x-6y+1=0与圆x²+y²-4x+2y-11=0相交于P.Q两点,求直线PQ的方程及公共弦PQ的长,
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![圆x²+y²+2x-6y+1=0与圆x²+y²-4x+2y-11=0相交于P.Q两点,求直线PQ的方程及公共弦PQ的长,](/uploads/image/z/12606027-51-7.jpg?t=%E5%9C%86x%26%23178%3B%2By%26%23178%3B%2B2x-6y%2B1%3D0%E4%B8%8E%E5%9C%86x%26%23178%3B%2By%26%23178%3B-4x%2B2y-11%3D0%E7%9B%B8%E4%BA%A4%E4%BA%8EP.Q%E4%B8%A4%E7%82%B9%2C%E6%B1%82%E7%9B%B4%E7%BA%BFPQ%E7%9A%84%E6%96%B9%E7%A8%8B%E5%8F%8A%E5%85%AC%E5%85%B1%E5%BC%A6PQ%E7%9A%84%E9%95%BF%2C)
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