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Jack is a student of Grade 7. His sister is Jenny. She is a student of Grade 8. They are in the same school. The new term is coming. They come to a store and buy some school things in it. Let’s have a look. Jack buys four notebooks and two pens. Jenny likes blue, so she buys a blue pencil box. The erasers look nice and she buys four.
Pencil box | Notebook | Eraser | Schoolbag | Pen | Pencil |
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¥20.00 | ¥3.50 | ¥1.50 | ¥58.00 | ¥16.00 | ¥3.00 |
| A．¥ 64.00 | B．¥ 10.50 | C．¥ 32.00 | D．¥ 46.00 |
| A．schoolbags | B．pens | C．erasers | D．notebooks |
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
