Calculation method of sum. Suppose there are two values a and b, then their sum can be expressed as a+B, for example, a=3 and b=5, then their sum is 3+5=8. If there are multiple values that need to be added, you can add them all with the summation symbol ∑. For example, if there is a set of values a 1, a2, a3 to an, then their sum can be expressed as ∑ai, where the value range of I is 1 to n. ..
Calculation method of difference. Suppose there are two values a and b, then their difference can be expressed as a-B, for example, a=5 and b=3, then the difference between them is 5-3=2. If you need to calculate the difference between multiple values, you can use the difference symbol? , subtract all. For example, if there is a set of values a 1, a2, a3 to an, then their difference can be expressed as? Ai, where the value range of I is 1 to n.
In mathematics, sum represents the result of adding two or more numerical values, and difference represents the result of subtracting two numerical values. These two concepts are very basic and important in mathematics, and they are widely used in various mathematical problems.
Calculating sum and difference can simplify the calculation process by using some mathematical skills. For example, you need to calculate the result of adding large numbers, first add them bit by bit from low to high, and then add the carry value to the higher value. You need to calculate the result of subtracting a large number. You can subtract them bit by bit from the lower order to the higher order, and then subtract the borrowed value from the higher order.
Mathematical application of sum and difference
1, and: In practical application, "and" can mean accumulation, summation, total, etc. For example, in statistics, the overall magnitude can be described by calculating the sum of a set of data; In financial management, you can calculate the total income or total expenditure of an enterprise, make analysis and make decisions; In physics, you can calculate the resultant force of multiple forces.
2. Difference: In practical application, "difference" can be used to indicate the difference and change between two numbers. For example, in mathematics, we can measure their relative size by calculating the difference between two numbers; In physics, the interval between events can be described by calculating the time difference between two moments.