①运动会上四年级同学进行队列表演,其中男生8行,女生5行,每行17人。一共有多少人?
②下面两个小长方形面积的和是多少?
③每包有17条毛巾,每箱装8包。5箱一共有多少条毛巾?
④每支笔8元,每个本5元,买17支笔和17个本一共多少元?
A.①②③ | B.②③④ | C.①②④ | 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