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【332366】2.5 第1课时 二次函数与一元二次方程

时间:2025-01-21 12:40:00 作者: 字数:2005字
简介:

2.5 二次函数与一元二次方程

1课时 二次函数与一元二次方程

  1. 抛物线 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴有 个交点,因为其判别式 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 0,相应二次方程 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的根的情况为

2.二次函数 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的图像与 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴的交点坐标为     

3.关于 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的方程 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 有两个相等的实数根,则相应二次函数 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴必然相交于 点,此时 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

4. 函数 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是常数)的图像与 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴的交点个数为(

A.0 B.1 C.2 D.1个或2

5.关于 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的二次函数 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的图像与 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴有交点,则 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的范围是(

A. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> B. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

C. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> D. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

6.函数 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的图象如图所示,那么关于 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的一元二次方程 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的根的情况是(

A.有两个不相等的实数根 B.有两个异号的实数根

C.有两个相等的实数根 D.没有实数根

Group 43





7. 若二次函数 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,当 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> )时,函数值相等,则当 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 时,函数值为(    )A. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>     B. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>     C. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>     D. <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

8.已知抛物线 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的顶点在抛物线 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 上,且抛物线在 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴上截得的线段长是 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,求 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的值.





9.已知函数 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

1)求证:不论 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 为何实数,此二次函数的图像与 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴都有两个不同交点;

2)若函数 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 有最小值 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,求函数表达式.





10.已知二次函数 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

1)求证:当 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 时,二次函数的图像与 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴有两个不同交点;

2)若这个函数的图像与 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴交点为 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,顶点为 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,且△ <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的面积为 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,求此二次函数的函数表达式.











11.已知抛物线 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴交于 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 点,与 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 轴交于 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 两点,顶点 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的纵坐标为 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,若 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是方程 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的两根,且 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

1)求 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 两点坐标;

2)求抛物线表达式及点 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 坐标;

3)在抛物线上是否存在着点 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,使△ <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 面积等于四边形 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 面积的2倍,若存在,求出 <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/885/" title="函数" class="c1" target="_blank">函数</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 点坐标;若不存在,请说明理由.