1.a yellow schoolbag
![](http://static.xuejinqu.com/qimg/dbb/dbba30c8c4da19de21e954c41678b55d.png)
2.a red balloon
![](http://static.xuejinqu.com/qimg/40e/40ea11d038cdb00860d37f9547fd434e.png)
3.a green ruler
![](http://static.xuejinqu.com/qimg/4c6/4c62c9dfddfbe52372dc688a375997d1.png)
4.a blue pen
![](http://static.xuejinqu.com/qimg/e85/e85954a5125e9ffd513e5f5bf362ce00.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)