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Quadratic conclusion of conic curve in high school mathematics. Who knows math?
Solving problems with coordinates is mainly to express the conditions: "the point is on the curve (ellipse or hyperbola)", the midpoint relationship, the slope formula, and then calculate the whole.

If eccentricity e is used, the above conclusions: (-ellipse b2/a2, hyperbola b2/a2) can be unified as (E 2)- 1.