甲:一瓶药有125粒,爷爷每天吃9粒,这瓶药够吃12天吗?
乙:一件衣服49元,要买4件这样的衣服,应付多少钱?
丙:一个鸡蛋大约重60克,12个鸡蛋大约重多少克?
丁:电影院有750个座位,一至三年级来了378人,四至六年级来了346人.六个年级的学生同时看,能坐得下吗?
A.甲和丁 | B.乙和丙 | C.甲和丙 | D.乙和丁 |
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