(1)求该抛物线的解析式;
(2)经过点B的直线交y轴于点D,交线段于点E,若.
①求直线的解析式;
②已知点Q在该抛物线的对称轴l上,且纵坐标为1,点P是该抛物线上位于第一象限的动点,且在l右侧.点R是直线上的动点,若是以点Q为直角顶点的等腰直角三角形,求点P的坐标.
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2