1.—Sam, how old are you?
![](http://static.xuejinqu.com/qimg/127/1279bd40d293851a6c54d4d9e0dda0ab.png)
—I am six.
2.—Mike, how old are you?
![](http://static.xuejinqu.com/qimg/127/1279bd40d293851a6c54d4d9e0dda0ab.png)
—I am nine years old.
3.—How old are you, Zhang Jie?
![](http://static.xuejinqu.com/qimg/127/1279bd40d293851a6c54d4d9e0dda0ab.png)
—I am seven.
4.—How old are you, Chen Peng?
![](http://static.xuejinqu.com/qimg/127/1279bd40d293851a6c54d4d9e0dda0ab.png)
—I am ten years old.
5.—Wu Dong, how old are you?
![](http://static.xuejinqu.com/qimg/127/1279bd40d293851a6c54d4d9e0dda0ab.png)
—I am eight years old.
![](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)