× | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
1 | 1×1=1 | ||||||||
2 | 2×2=4 | ||||||||
3 | 3×3=9 | ||||||||
4 | 4×4=16 | ||||||||
5 | 5×5=25 | ||||||||
6 | 4×6=24 | ||||||||
7 | 3×7=21 | ||||||||
8 | 2×8=16 | ||||||||
9 | 1×9=9 |
观察上面的表格,你发现了什么?跟爸爸、妈妈讲一讲.
横着看: .
竖着看: .
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