(1)我们列表来数一数。
同学1 | 同学2 | 同学3 | 同学4 | 同学5 | |
同学1 | |||||
同学2 | |||||
同学3 | |||||
同学4 | |||||
同学5 |

(3)探索规律。
参赛人数 | 计算过程 | 比赛场次 |
3 | 1+2=3 | 3 |
4 | 1+2+3=6 | 6 |
5 |

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

