直线ax+by+c=0与圆x方+y方=9相交于两点M,N,若c方=a方+b方,则OM向量与ON向量的数量积是?(O为坐标原点)
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![直线ax+by+c=0与圆x方+y方=9相交于两点M,N,若c方=a方+b方,则OM向量与ON向量的数量积是?(O为坐标原点)](/uploads/image/z/10144411-43-1.jpg?t=%E7%9B%B4%E7%BA%BFax%EF%BC%8Bby%EF%BC%8Bc%EF%BC%9D0%E4%B8%8E%E5%9C%86x%E6%96%B9%EF%BC%8By%E6%96%B9%EF%BC%9D9%E7%9B%B8%E4%BA%A4%E4%BA%8E%E4%B8%A4%E7%82%B9M%2CN%2C%E8%8B%A5c%E6%96%B9%EF%BC%9Da%E6%96%B9%EF%BC%8Bb%E6%96%B9%2C%E5%88%99OM%E5%90%91%E9%87%8F%E4%B8%8EON%E5%90%91%E9%87%8F%E7%9A%84%E6%95%B0%E9%87%8F%E7%A7%AF%E6%98%AF%3F%EF%BC%88O%E4%B8%BA%E5%9D%90%E6%A0%87%E5%8E%9F%E7%82%B9%EF%BC%89)
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