1. It is known that the two vertices of triangle ABC are a (0,0) B (6,0), and vertex C moves on the curve (xsquare / 16) - (ysquare / 9) = 1-------- 2. If the points P and Q are on the parabola y square = 4 (x square), O is the origin of the coordinates, and (OP vector) x (OQ vector) = 0, then the fixed-point coordinates of the straight line are--------- 3. Given triangle ABC, if Mn is the midpoint of AB and AC respectively, then the product of eccentricity of ellipse and hyperbola with B and C as focus and passing through M and N is--------

1. It is known that the two vertices of triangle ABC are a (0,0) B (6,0), and vertex C moves on the curve (xsquare / 16) - (ysquare / 9) = 1-------- 2. If the points P and Q are on the parabola y square = 4 (x square), O is the origin of the coordinates, and (OP vector) x (OQ vector) = 0, then the fixed-point coordinates of the straight line are--------- 3. Given triangle ABC, if Mn is the midpoint of AB and AC respectively, then the product of eccentricity of ellipse and hyperbola with B and C as focus and passing through M and N is--------

1. (3x-6) ^ 2 / 16-y ^ 2 = 1 (y is not 0) 2.. the parabola form is wrong 3. If the question is an equilateral triangle, the answer is 2