Formula calculation is a recursive equation calculation, which is an operation to write out the calculation process completely, that is, vertical calculation. After studying vertical calculation, you will learn formulas that can be used for continuous calculation, such as mixed operation. When calculating mixed operations, it is generally to calculate a formula step by step (step by step, the original formula cannot be written with an equal sign), and the process of each step should be written out.
Generally speaking, the equal sign should go forward and not be aligned with the first line. That is, to leave the original calculation. The main thing to master is to remember to calculate multiplication and division before adding and subtracting. In the continuous calculation of multiplication and division, it should be calculated from left to right. When you encounter parentheses, you must first calculate the inside of parentheses.
In the process of separation, the operation sequence line should be drawn according to the operation sequence, and the "three checks" should be done well. First of all, check whether the numbers and symbols copied from books to exercise books are correct. Second, check whether the numbers and symbols copied from horizontal to vertical are copied correctly. Third, it is necessary to check whether the draft is copied vertically, horizontally, and whether the decimal point position is correct or not.
Extended data:
Among the four operations, addition and subtraction are called primary operations, and multiplication and division are called secondary operations. Expressions that contain two or more operations are usually called mixed operations. The mixed operation of addition, subtraction, multiplication and division is also called elementary arithmetic. In elementary arithmetic, the prescribed calculation order is called operation order. Mathematically speaking, the order of these four operations is as follows:
1, write the equal sign directly in one step: if you want to write vertically in the middle of the horizontal direction. (that is, the position of the horizontal form in the second number) If the calculation is carried out in two steps, a recursive equation will be used. Every step should be aligned with the equal sign, the two lines of the equal sign should be parallel, and the length of the equal sign line should be about half a centimeter.
2. Two-step calculation: Recursive equations should be used, and the equal signs in each step should be aligned and the two lines of the equal signs should be parallel.
When moving to the next column, draw a dotted line in the middle to separate it. If there are brackets, count the numbers in brackets first. The equipotential line is about half a centimeter long. If you want to write vertically in the middle of the horizontal direction.
3. Calculation in more than two steps: Recursive equations should be used, each step of the equal sign should be aligned, the two lines of the equal sign should be parallel, and the length of the equal sign line should be about half a centimeter.
Calculation method: from left to right, the first number in brackets.
Specific examples
Example:
485 - ( 6 × 4 + 32 )
= 485 - ( 24 + 32 )
= 485 - 56
= 429
1000 - ( 500 + 499 + 1 )
= 1000 - 1000
= 0
365 1 × { 452 - [ 52 + ( 500 - 100 ) ] }
= 365 1 × { 452 - [ 52 + 400 ] }
= 365 1 ×{ 452 - 452 }
= 365 1 × 0
= 0
References:
Baidu Encyclopedia-Informal Computing