①要修一条1.2千米的小路,每天修0.5千米,几天修完?
②小明用1.2元买了0.5千克苹果,每千克苹果要多少钱?
③聪聪跑了1.2千米,明明跑的路程是聪聪的一半,明明跑多少千米?
④一个平行四边形的面积是1.2m2,高0.5m,与这条高对应的底边是多少m?
A.①② | B.①②④ | C.①③④ | D.①②③④ |
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