(1)火柴盒外壳的上、下两个面都贴有商标纸,这两个面的面积和是多少?
(2)外壳的前、后两个面上贴的是擦火柴的专用纸,该专用纸的面积共是多少?
(3)外壳由硬纸板做成,做这个外壳共需多少硬纸板?
(4)外壳的里面是内盒,忽略纸板厚度,做这个内盒要用多少硬纸板?
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