在平面直角坐标系xOy中,已知圆C:x2+y2=r2和直线l:x=a(2013•南通二模)在平面直角坐标系xOy中,已知圆C:x²+y²=r²和直线l:x=a(其中r和a均为常数,且0<r<a),M为l上一动点,A₁,
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![在平面直角坐标系xOy中,已知圆C:x2+y2=r2和直线l:x=a(2013•南通二模)在平面直角坐标系xOy中,已知圆C:x²+y²=r²和直线l:x=a(其中r和a均为常数,且0<r<a),M为l上一动点,A₁,](/uploads/image/z/8664666-42-6.jpg?t=%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BBxOy%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5%E5%9C%86C%EF%BC%9Ax2%2By2%3Dr2%E5%92%8C%E7%9B%B4%E7%BA%BFl%EF%BC%9Ax%3Da%EF%BC%882013%26%238226%3B%E5%8D%97%E9%80%9A%E4%BA%8C%E6%A8%A1%EF%BC%89%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BBxOy%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5%E5%9C%86C%EF%BC%9Ax%26%23178%3B%2By%26%23178%3B%3Dr%26%23178%3B%E5%92%8C%E7%9B%B4%E7%BA%BFl%EF%BC%9Ax%3Da%EF%BC%88%E5%85%B6%E4%B8%ADr%E5%92%8Ca%E5%9D%87%E4%B8%BA%E5%B8%B8%E6%95%B0%2C%E4%B8%940%EF%BC%9Cr%EF%BC%9Ca%EF%BC%89%2CM%E4%B8%BAl%E4%B8%8A%E4%B8%80%E5%8A%A8%E7%82%B9%2CA%26%238321%3B%2C)
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