⑴把黑棋子和白棋子按照下面的顺序排列,第988个棋子应该是什么颜色?
●●●○○○○○●●●○○○○○…
⑵今天是星期二,从今天算起,第58天是星期
⑶一列数按“1,4,2,8,5,7,1,4,2,8,5,7,1,4,2,8,5,7…”排列,问第30个数字是几
⑷○□□△○□□△○□□△…第22个图形是
⑸○◎□○◎□○◎□○…第20个图形是
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