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1、学习好资料欢迎下载课题二次函数图象与系数符号学习目标：1探索发现二次函数的系数a,b,c,的符号与图象之间的关系；2由抛物线确定 a,b,c,及相关代数式的符号；学习过程一、知识回顾：1.抛物线 y=ax2+bx+c 的开口方向由决定：开口向上开口向下.2.抛物线 y=ax2+bx+c 与 y 轴的交点坐标是（）.co与 y 轴的交点在；c0 开口向下ao 与 y 轴交点在负半轴上co 与 x 轴有 1 个交点=o 与 x 轴没有交点0 且 b2-4ac0 B.a0且 b2-4ac0 C.a0 且 b2-4ac0 D.a 0且 b2-4ac 0 五、拓广探索：观察抛物线图象填空：(1)方程 a
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