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以抛物线为载体的动态综合题一直是各地中考命题的热点,这类问题往往线条繁多,而且容易与平面几何中的特殊图形综合在一起考查,2014年河南省压轴题就有这个特点,下面就给出思路突破和解后反思,启发同学们思考.考题(2014·河南)如图1,抛物线y=-x2+bx+c与x轴交于A(-1,0),B(5,0)两点,直线y=-3/4x+3与y轴交于点C,与x轴交于点D.点P是x轴
The dynamic synthesis problem with the parabola as the carrier has been a hot topic in the entrance examinations all over the world. Such problems often have many lines and are easy to examine together with the special graphics in the plane geometry. This feature was found in the Henan Province Finale in 2014, (2014 · Henan) As shown in Figure 1, the parabola y = -x2 + bx + c and the x-axis intersect at A (-1,0), B (5,0 ), The straight line y = -3 / 4x + 3 intersects the y-axis at point C and the x-axis intersects point D. Point P is the x-axis