生成解题过程动画---**General Topic:**
二次函数常考 (Commonly tested quadratic functions)
**Question Stem:**
【例】 抛物线 $y=ax^2 + bx + c$ 如图所示，则用“>” “<” 或 “=” 填空:
(Example: The parabola $y=ax^2 + bx + c$ is shown in the figure. Fill in the blanks with ">", "<" or "=":)
**Mathematical Expressions to Complete:**
(1) $a$ ___ 0.
(2) $c$ ___ 0.
(3) $b^2 - 4ac$ ___ 0.
(4) $-\frac{b}{2a}$ = ___.
(5) $b$ = ___ $a$.
(6) $b$ ___ 0.
(7) $abc$ ___ 0.
(8) $a + b + c$ ___ 0.
(9) $a - b + c$ ___ 0.
(10) $4a + c$ ___ 0.
(11) $4a + 2b + c$ ___ 0.
(12) $4a - 2b + c$ ___ 0.
**Chart/Diagram Description:**
* **Type:** Cartesian coordinate system showing a parabola.
* **Coordinate Axes:**
* X-axis: Labeled with 0 (origin) and -1.
* Y-axis: Labeled with 0 (origin).
* **Parabola Features:**
* The parabola opens downwards.
* It intersects the Y-axis at a positive Y-value.
* It intersects the X-axis at two distinct points: one at $x = -1$ and another at a positive X-value (appears to be between 1 and 2).
* The axis of symmetry (a vertical dashed line) is located to the right of the Y-axis (i.e., in the first quadrant).
* The vertex of the parabola is in the first quadrant.
**Other Relevant Text/Annotations (from the social media context):**
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