①明明折飞机用了一张纸的,折星星用了这张纸的,折飞机比折星星多用了这张纸的几分之几?
②明明折飞机用了一张纸的,折星星用了这张纸的,折飞机和折星星共用了这张纸的几分之几?
③修一段路第一天修了千米,第二天修了千米,两天一共修了多少千米?
A.①② | B.②③ | C.①③ | D.①②③ |
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