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There are many things on the teacher's desk．This is Chen Jie's pencil-case．Look! She has thirteen pencils and fifteen erasers．This is John's bag．It's big．He has nineteen books and eleven pens．This is Wu Yifan's bag．He has sixteen pencils and nine sharpeners．This is Sarah's pencil-case．She has fourteen pens and eight pencils．
| | books | pens | erasers | pencils | sharpeners |
| Chen Jie | | | | | |
| John | | | | | |
| Wu Yifan | | | | | |
| Sarah | | | | | |
同类型试题
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
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
