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4. 如图:

(1) 求该抛物线的解析式;
(2) 根据图象回答: 当 x 为何范围时, 该函数值大于 0。

Graph of a parabola opening upwards. The parabola passes through (0, 0) and (2, 0). The vertex is at (1, -1). The axis of symmetry is the line x=1.
Graph of a parabola opening upwards. The parabola passes through (0, 0) and (2, 0). The vertex is at (1, -1). The axis of symmetry is the line x=1.

5. 已知抛物线经过 A(-3, 0) B(0, 3) C(2, 0) 三点。

(1) 求这条抛物线的解析式;
(2) 如果点 D(1, m) 在这条抛物线上, 求 m 值和点 D 关于这条抛物线对称轴的对称点 E 的坐标, 并求出 \tan \angle ADE 的值。

6. 如图, 某建筑物从 10m 高的窗口 A 用水管向外喷水, 喷出的水呈抛物线状, 如果抛物线的最高点 M 离墙 1m, 离地面 \frac{40}{3} m, 求水流落点 B 离墙的距离 OB 的长。

Diagram showing a parabolic trajectory of water. The origin O is at the base of the wall. The y-axis represents the wall height. Water starts at point A on the y-axis (the window). The trajectory reaches a maximum height at point M. The water lands at point B on the x-axis (the ground).
Diagram showing a parabolic trajectory of water. The origin O is at the base of the wall. The y-axis represents the wall height. Water starts at point A on the y-axis (the window). The trajectory reaches a maximum height at point M. The water lands at point B on the x-axis (the ground).

7. 已知某绿色蔬菜生产基地收获的大蒜, 从四月一日起开始上市的 30 天内, 大蒜每 10 千克的批发价 y (元) 是上市时间 x (天) 的二次函数, 有近几年的行情可知如下信息:

x (天) 5 15 25
y (元) 15 10 15

(1) 求 y x 的函数关系式;
(2) 大蒜每 10 千克的批发价为 10.8 元时, 问此时是在上市的多少天?

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