Calculation force of bracket

1.

The function of parentheses in primary school mathematics is to specify the operation order

here we need to answer with specific examples:

when calculating simple mathematical calculation problems, the problems contain a variety of operation orders, then the operation order is: first in brackets, then out of brackets. If calculation is required: 2 × 2 + 4)

here we need to calculate the operation in brackets: 2 + 4 = 6; Operations outside the brackets: 2 × 6=12 Instead of following the progressive steps, the function of parentheses here is to specify the operation order

extended data:

I. operation order in Mathematics:

1. Real number operation: calculate the power (root), then multiplication and division, and finally addition and subtraction

2. If there are brackets, the operations in the brackets should be calculated first. The same level of operations should be carried out from left to right

Second, change the operation order:

in addition and subtraction, the operation order can be changed, for example: 3-8 + 5, can be changed to 3 + 5-8, move 5 to the front of - 8, when you move, you should bring the front operation symbols together, change the operation order is nothing more than to simplify the operation

2. How to calculate the recursive equation with brackets and brackets, for example,
first calculate the operation in brackets,
then calculate the operation in brackets,
finally calculate the operation outside brackets< br />8x[10 ÷( 3-1)]
=8x[10 ÷ 2]
= 8x5
= 40
subtract first, then divide, and finally multiply.

3. There are two small brackets, first calculate the inside, then calculate the outside. The calculation order of parentheses, brackets and braces is small first, then middle, and finally large.

4. First of all, we should give some examples
to have a fuzzy understanding
and then summarize the rule
that is, before the bracket is the minus sign, after removing it
add, change, subtract, change, add
if it is the plus sign, then do not change

5. What's the role of parentheses in calculation?

the role of parentheses in calculation is:
change the operation order

in the calculation problem with parentheses, first calculate the operation in parentheses, and then calculate the operation outside parentheses.

I hope it can help you

6.

1、 Different functions

1. Braces: this symbol represents the purpose through instructions and formulas in a wide range

Parentheses: the function of parentheses in primary school mathematics is to specify the operation order

(2) different operation rules

1) braces: the operation rule is first small braces, then big braces

2. Parentheses: the order of operation is first in parentheses and then out of parentheses. If it is necessary to calculate 2 × 2+4

Three, different characteristics

1, brace: in mathematics, it can be the symbol of set, such as: a = {x | X & gt; 1} In mathematics, when there is only one number in braces, it can represent the decimal part of the number. For example: {5.1} means 0.1

2. Parentheses: if there are parentheses, the operations in the parentheses should be calculated first. The same level of operations should be carried out from left to right

7. The shift key and the 9 key of the main keyboard are pressed at the same time, which is the bracket on the left.
the shift key and the 0 key of the main keyboard are pressed at the same time, which is the bracket on the right

8.

The position of the parentheses on the keyboard is located in the position of the numbers "9" and "0", which can be directly input by the keyboard

the keyboard input method is to press and hold the "shift" key and the number "9" of the computer to input the left half bracket, and press and hold the "shift" key and the number "0" of the computer to input the left half bracket (as shown in the figure)

extended data:

bracket () mathematical usage

bracket is a symbol used to specify the operation order

The earliest bracket appeared in 1544 is the small bracket "()"

It was not until the 17th century that the bracket "[]" appeared in the works of Wallis (1616-1703) in England. As for the bracket, it was first used by Widal (1540-1603) in 1591, while the brace "{}" was first introced by Widal in 1593, mainly used to indicate the set of a number; By 1629, killard of the Netherlands had adopted all brackets, which began to be used in the world after the 18th century

with the deepening of mathematics learning, all brackets can be replaced by "()", which is convenient and can avoid too few brackets

In elementary number theory, it is used to express the greatest common divisor, such as (111148) = 37

9. 35+6-32-5-7
=35+6-27-7
=41-27-7
=14-7
=7