二次函数图像
Quadratic Graphs
认识二次函数会产生弯曲（抛物线）的图像，并能区分二次函数图像与一次函数（直线）图像；能利用所绘制的二次函数图像估算数值，并找到近似解。
Recognise that quadratic functions produce curved (parabolic) graphs, distinguish them from linear graphs, and use plotted quadratic graphs to estimate values and find approximate solutions
学习证据 / Evidence
- 解释为什么 x² 的图像是 U 形曲线而不是直线
- 根据数值表绘制简单的二次函数图像，例如 y = x² − 4
- 从二次函数图像中读出近似解（例如 y = 0 时对应的 x 值）
- Explain why x² produces a U-shaped curve rather than a straight line
- Plot a simple quadratic such as y = x² − 4 from a table of values
- Read approximate solutions from a quadratic graph (e.g., where y = 0)
评估问题 / Assessment
{{name}}能否认识到像 y = x² 这样的方程得到的是弯曲的图像而不是直线，并能利用绘制的曲线估算数值？
Can {{name}} recognise that an equation like y = x² produces a curved graph rather than a straight line, and use a plotted curve to estimate values?