(1)求抛物线的对称轴.
(2)当时,将抛物线向左平移2个单位,再向下平移1个单位,得到抛物线.
①求抛物线的解析式.
②设抛物线与轴交于,两点(点在点的右侧),与轴交于点,连接.点为第一象限内抛物线上一动点,过点作于点.设点的横坐标为.是否存在点,使得以点,,为顶点的三角形与相似,若存在,求出的值;若不存在,请说明理由.
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