For example, in a÷b, A is called the first term of the ratio and B is called the last term of the ratio. The quotient of a÷b is called the ratio of a ∶ b. In the ratio of two numbers, the number before the comparison sign is called the first term of the ratio, and the number after the comparison sign is called the last term of the ratio. The quotient obtained by dividing the former term by the latter term is called the ratio. (The ratio is usually expressed in fractions, but it can also be expressed in decimals or integers). ?
The ratio can represent the relationship between two identical quantities, that is, the multiple relationship. You can also use the ratio of two different quantities to represent a new quantity. For example: distance: time = speed. For example, 3: 4: 5 is pronounced as 3: 4: 5 (:not a division symbol).
Distinguish ratio and ratio: ratio indicates the relationship between two numbers, which can be written in the form of ratio or in fractions. Ratio is equivalent to quotient, and it is a number, which can be an integer, a fraction or a decimal.
When calculating the ratio between two quantities, the key is to grasp the following three points: analyze the meaning of the question and find out exactly what the two related quantities are; Find out the specific quantities corresponding to the two related quantities, and then compare them as required; When the specific quantity is not directly told in the title, we can determine the share or score of the two quantities by assuming and transforming, and finally find out the ratio of the two quantities.
For example, knowing the ratio of two people's distance and time is equivalent to knowing the number of copies of two people's distance and time, and then dividing the distance by time, you can find out everyone's speed, and finally you can find out the speed ratio of two people. If the units of the two ratios are both "1", then the two ratios can be directly added, subtracted, multiplied and divided.