(1)【问题再现】如图1,在中,的角平分线交于点P,若.则______;
(2)【问题推广】如图2,在中,的角平分线与的外角的角平分线交于点P,过点B作于点H,若,则______;
(3)如图3,如图3,在中,、的角平分线交于点,将沿DE折叠使得点与点重合.
①若,则______;
②若,求证:;
(4)【拓展提升】在四边形中,,点F在直线上运动(点F不与E,D两点重合),连接的角平分线交于点Q,若,直接写出∠Q和α,β之间的数量关系.
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