(1)大瓶的净含量是5升,小瓶的净含量是0.5升。两种包装的“84消毒液”各多少瓶?
(2)课桌椅需要用有效氯含量为250mg/L的消毒剂进行消毒(具体数值见下表),30分钟后再用清水擦拭干净。现在要用“84消毒液”加水配置出10升消毒剂,用于消毒课桌椅,需要“84消毒液”多少毫升?
有效氧含量(mg/L) | 84消毒液(ml) | 水(ml) |
100 | 2 | 998 |
250 | 5 | 995 |
500 | 10 | 990 |
1000 | 20 | 980 |
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