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20 15 Jinan senior high school entrance examination mathematics question 28, question 2, What can't there be only one answer? (-1,1)?
The answer should be two p points.

The point p in the left half of the parabola should be obtained by similar area subtraction: when passing through point P, PD is parallel to the Y axis, PD is perpendicular to BD at point D, and BD intersects the Y axis at point E.

S triangle PBC=S triangle PDB-S triangle CEB-S trapezoid PDEC