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The first volume of the third grade mathematics in Beijing Normal University
According to the analytical formula of parabola, the coordinates of point E can be obtained, and through the simultaneous analytical formula of BC line, the coordinates of point C can be obtained. Then the area of quadrilateral BDEC can be obtained by the area difference between △AEC and △ABD;

Substitute the coordinate of b (0, 1) into the parabola to get c= 1.

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