有一匹骡子,肚子饿了,到外面找青草吃。走不多远,便找到了一块青草很多的牧场,欢喜极了,预备大吃一顿。
它抬头一望,觉得左边的草好些,便跑到左边去;但到了左边时,抬头一望,又觉得右边的草好些,便又跑回右边去。这样反反复复的左边望望,右边望望,左边跑跑,右边跑跑,青草一根也没到口,竟活活地饿死了。
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