①一个长方形的长是m,宽是m,周长是多少来?
②便民水果店进了一批西瓜,上午卖出这批西瓜的,下午卖出这批西瓜的,全天卖出这批西瓜的几分之几?
③学校第一次运来吨沙子,第二次运来吨沙子,两次一共运来多少吨沙子?
④兰兰折飞机用了张纸,折星星用了张纸,折飞机比折星星少用了多少张纸?
A.②③ | B.①③ | C.①②③ | 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