![](http://static.xuejinqu.com/qimg/af2/af23a18ab3601a06df82e805f55aeddd.png)
![](http://static.xuejinqu.com/qimg/bb6/bb69145ac72c554ac49090cb3ee9c5ac.png)
He played basketball one year ago.
He plays football now.
1.
![](http://static.xuejinqu.com/qimg/c96/c96e87eabada86e9ab87653c28eed531.png)
![](http://static.xuejinqu.com/qimg/198/19892736746159c8f1dffbf8fce62d4c.png)
2.
![](http://static.xuejinqu.com/qimg/fc5/fc59d7b5bdc57afdee630caed5f09744.png)
![](http://static.xuejinqu.com/qimg/3a4/3a40349a759236a835a1bdfb7119b3da.png)
3.
![](http://static.xuejinqu.com/qimg/d55/d558c7cf33e5a29e1f112edd12e03da6.png)
![](http://static.xuejinqu.com/qimg/996/996e33b3e6cc209c978fdf214517d524.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)