(1)如图1,当点D落在AB的延长线上时,过点D作交AC的延长线于点E,若BC=2,求DE的长;
(2)如图2,当点D落在CB的延长线上时,连接AD,过点C作CF⊥AB于点F,延长CF交AD于点E,连接BE,求证:;
(3)如图3,在(2)的条件下,将沿AC翻折得到,M为直线AD上一个动点.连接BM,将沿BM翻折得到.当最小时,直接写出的值.
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