What is the difference between 12 and 2 3 and 7 and 2 3?

The main thing to master is to remember to calculate multiplication and division first, and then addition and subtraction. In the case of multiplication and division, the calculation is performed in order from left to right. When you encounter parentheses, you want to first calculate the inside of the parentheses.

In the process of detachment, it is necessary to draw the line of the operation order according to the order of operation, and also to achieve "three checks", one is to check whether the numbers and symbols copied from the book to the homework book are correct. Second, it is necessary to check whether the numbers and symbols from horizontal copying to draft vertical copying are correct. Third, it is necessary to check whether the number of the draft is copied vertically, whether it is copied correctly on the horizontal type, whether the decimal point is in the right place, and whether there is any omission.

Four orders of operations.

Of the four operations, addition and subtraction are called first-level operations, and multiplication and division are called second-level operations. An equation that contains two or more operations is often referred to as a hybrid operation. The mixed operations of addition, subtraction, multiplication, and division are also called four mixed operations.

In the four mixed operations, the specified order of calculations is called the order of operations. The mathematically prescribed order of four operations is as follows:

1) Sibling operations in an equation, if only sibling operations are included, they should be performed in order from left to right. That is, mixed operations with only addition and subtraction, or only multiplication and division, in the order of operation from left to right.

2) Level 1 to 2 operations.

In an equation, if there are both first-level and second-level operations, then the second-level operation should be calculated first, and then the first-level operation. That is, "multiplication and division first, then addition and subtraction", referred to as "multiplication and division first, then addition and subtraction".

3) Parenthetical operations.

If you want to change the order of operations mentioned above, you need to use parentheses. There are three commonly used parentheses: small parentheses, denoted as parentheses in ( ), denoted as [ ; Braces, denoted as When using parentheses, pull on both sides and add them in the middle.

Use parentheses first, then braces, and finally curly braces.

In an equation, if there are several parentheses, you should first calculate the multiplication or division in the parentheses, then the addition or subtraction in the parentheses, and finally the braces. When calculating, the formula inside the parentheses should be calculated in the order mentioned above, and then the resulting result should be calculated in the same order as the numbers outside the parentheses.

If we have this problem, we can calculate it by taking it off the form, and the calculation process is as follows.

12 and 2 3-7 and 2 3

First, through the denominator Yu Tangerine, find the least common multiple, and calculate 7 12 + 2 3 = 7 12 + 8 12 = 15 12In the result of 15 12 simplified 5 4

7 and 2 3 + 3 and 5 6

46 Lu Hao 6 + 23 6

69 6 = 23 type 2 = 11 and lead 1 2

What is the difference between 3/7 minus 1/2 and 3/7 plus 2/1 and so on?

3 7 + 3 7) + (1 2-1 2) megapei.

Answer: It depends on the question.

Digging (3 4-2 4) 8 17

Therefore, the difference between three-quarters and one-half of the ten is eight-sevenths of the judgment of Bira (two-seventeenth). Dig a few digs.

Hello! Glad for your question!

According to the question, the answer is carried with the Italian formula: 85 27 7 3 85 27 63 27 22 27

Answer: Three and four-sevenths, minus two and one-third equals 22 27.

Yours is the greatest support to me! Break a leg! Thank you!

3 and 4 27-2 and liquid J-1 3

1-5 Balance Punch Block Width 27