Sat数学难題---**Extraction Content:** **Question Stem:** 已知二次函数 y = ax² + bx + c 的图像的一部分如图 2-3-2 所示, 求 a 的取值范围。 **Mathematical Formula:** y = ax² + bx + c **Chart/Diagram Description:** * **Type:** A 2D Cartesian coordinate system showing a portion of the graph of a quadratic function. * **Main Elements:** * **Coordinate Axes:** Horizontal X-axis pointing right with label 'x'. Vertical Y-axis pointing up with label 'y'. The intersection of the axes is the origin, labeled 'O'. * **Points:** * A point on the Y-axis is marked with the label '1', indicating the point (0, 1). * A point on the X-axis is marked with the label '1', indicating the point (1, 0). * **Curve:** A curved line representing a part of a parabola. * The curve passes through the point (0, 1). * The curve passes through the point (1, 0). * The curve opens downwards, which is evident from the shape shown. * The visible part of the curve is in the first and second quadrants, specifically above the x-axis between the y-axis and x=1, and also passes through (1,0). A small portion to the left of the y-axis is also visible above the x-axis. The vertex is not shown. * **Labels and Annotations:** The origin is labeled 'O'. The positive directions of the axes are labeled 'x' and 'y'. The points (0,1) and (1,0) are marked with '1' on their respective axes. * **Figure Label:** 圖 2-3-2 **Options:** None provided in the image.