圆方程.已知圆x^2+y^2=4和点M(1,a),(1)若过点M有且只有一条直线与圆O相切,求实数a的值,并求出切线方程;(2)若a=根号二,过点M的圆的两条弦AC,BD互相垂直,求AC+BD的最大值.
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![圆方程.已知圆x^2+y^2=4和点M(1,a),(1)若过点M有且只有一条直线与圆O相切,求实数a的值,并求出切线方程;(2)若a=根号二,过点M的圆的两条弦AC,BD互相垂直,求AC+BD的最大值.](/uploads/image/z/5086472-32-2.jpg?t=%E5%9C%86%E6%96%B9%E7%A8%8B.%E5%B7%B2%E7%9F%A5%E5%9C%86x%5E2%2By%5E2%3D4%E5%92%8C%E7%82%B9M%EF%BC%881%2Ca%EF%BC%89%2C%EF%BC%881%EF%BC%89%E8%8B%A5%E8%BF%87%E7%82%B9M%E6%9C%89%E4%B8%94%E5%8F%AA%E6%9C%89%E4%B8%80%E6%9D%A1%E7%9B%B4%E7%BA%BF%E4%B8%8E%E5%9C%86O%E7%9B%B8%E5%88%87%2C%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%80%BC%2C%E5%B9%B6%E6%B1%82%E5%87%BA%E5%88%87%E7%BA%BF%E6%96%B9%E7%A8%8B%EF%BC%9B%EF%BC%882%EF%BC%89%E8%8B%A5a%3D%E6%A0%B9%E5%8F%B7%E4%BA%8C%2C%E8%BF%87%E7%82%B9M%E7%9A%84%E5%9C%86%E7%9A%84%E4%B8%A4%E6%9D%A1%E5%BC%A6AC%2CBD%E4%BA%92%E7%9B%B8%E5%9E%82%E7%9B%B4%2C%E6%B1%82AC%2BBD%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC.)
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