1.count
![](http://static.xuejinqu.com/qimg/520/5205f6f3e4b3872806469418cefea67a.png)
2.thirteen
![](http://static.xuejinqu.com/qimg/520/5205f6f3e4b3872806469418cefea67a.png)
3.fourteen
![](http://static.xuejinqu.com/qimg/520/5205f6f3e4b3872806469418cefea67a.png)
4.fifteen
![](http://static.xuejinqu.com/qimg/520/5205f6f3e4b3872806469418cefea67a.png)
5.sixteen
![](http://static.xuejinqu.com/qimg/520/5205f6f3e4b3872806469418cefea67a.png)
6.twenty
![](http://static.xuejinqu.com/qimg/520/5205f6f3e4b3872806469418cefea67a.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)