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中考中的代数几何综合题对于同学们来说是一道较难的题,不少学生不知从何处入手,找不到方向.特别是题目的第二问和第三问,大部分学生难以找到突破口.本文试举两例分析如下.例1(2014年北京市朝阳二模)如图1,在平面直角坐标系xOy中,二次函数y=ax2-2ax+3的图像与x轴分别交于点A、B,与y轴交于点C,AB=4,动点P从B点出发,沿x轴负方向以每秒1个单位长度的速度移
Algebraic geometry in the senior high school entrance examination questions for the students is a more difficult problem, many students do not know where to start, can not find the direction .Especially the second and third question asked, most students find it difficult to find Breakthrough .This article cites two cases as follows.Example 1 (Beijing Chaoyang second model in 2014) Figure 1, in the rectangular Cartesian coordinate system xOy, quadratic function y = ax2-2ax +3 image and the x-axis were At point A, B, and the y-axis intersection point C, AB = 4, starting point P starting point B, along the x-axis negative direction at a unit length of 1 second per second