Through the left focus F of the ellipse x ^ 2 / 36 + y ^ 2 / 27 = 1, make a chord AB that is not perpendicular to the major axis. If the vertical bisector of AB intersects the X axis at n, then FN / ab=

Forget it
Give you a clever way: from the problem, we can know the fixed value of this proportion, so take AB parallel to the X axis
AB = 12, fo = 3. So FN / AB = 0.25

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