测量次数(次) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
影长(厘米) | 90 | 60 | 45 | 35 | 30 | 25 | 30 | 35 | 45 |
1.观察上表,在这段时间里,第
2.从上表中可以推测出,测量开始4.5小时后竹竿影子长度为
3.从上表中可以知道,这段时间影子长度变化的规律是
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