名称 | 铅笔 | 铅笔盒 | 钢笔 | 橡皮 | 直尺 |
单价 | 2元7角 | 6元5角 | 9元 | 5角 | 1元 |
(1)铅笔盒和尺子,一共用了多少钱?
(2)钢笔比铅笔贵多少多少钱?
(3)50元买5支钢笔够吗?
(4)你还能提出其他数学问题并解答吗?
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