Does the landlord use p? q？ Solve the coordinates and use? PM=QM, simultaneous equation ... solution E, this method is also correct.

Because we can solve p and p first? q？ Coordinate, and then set the m coordinate (x, 0), with? PM=QM, but in the end eccentricity is required, and B? Change it to c? -a？ To solve the abscissa x of m, the following method is the same as the answer. In addition, the amount of calculation will be greater than the amount of calculation of the answer.