1.six birds
![](http://static.xuejinqu.com/qimg/556/5561ad3b8b8798455d554e4ee6d59914.png)
2.three girls
![](http://static.xuejinqu.com/qimg/864/864603ff1b699bccb2331747c54f37b5.png)
3.four flowers
![](http://static.xuejinqu.com/qimg/0d4/0d47710cb516d8bc1bb2774288102745.png)
4.eight balloons
![](http://static.xuejinqu.com/qimg/2a5/2a522fefa6c5a8e3769cbda16e4ccb2f.png)
![](http://static.xuejinqu.com/images/y-prise.png)
同类型试题
![](http://static.xuejinqu.com/images/medal.png)
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
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)
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
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)