明明带18元去超市购物.请你圈一圈,并算出买每样物品所用的钱数,填在下表中.
物品 | 文具盒 | 钢笔 | 笔记本 |
占总钱数的几分之几 | |||
| ○○○○○○ ○○○○○○ ○○○○○○ | ○○○○○○ ○○○○○○ ○○○○○○ | ○○○○○○ ○○○○○○ ○○○○○○ |
钱数/元 | | | |
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