名称 | 书包 | 文具盒 | 彩笔 | 故事书 | 擦子 |
单价(元) | 16.50 | 5.30 | 6.50 | 3.40 | 1.20 |
(1)张老师买5个文具盒,一共用多少元?
(2)小红买一个书包、一盒彩笔和3个擦子,共用去多少元?
(3)如果给你30元,买上面哪些物品,你能刚好全部用完?
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