Xiaohong and Xiaoli read the same book, read 8 pages a day, and after 9 days, how many pages did the

Hello. Just two numbers, two more? The problem is not comprehensive.

8*9=72 pages.

In the operation of numbers, there are four kinds of operations: addition (+), subtraction (-), multiplication ( ) and division ( ), and we are mathematically in order to be able to calculate them more conveniently, referred to as simple calculation, and there are the following kinds of simple calculations (see the product of commonly used special numbers and the simplified calculation formula for details).

Addition: (Addition Commutative Law) (Addition Commutative Law) (Approximate Number) Multiplication: (Multiplicative Commutative Law) (Multiplicative Commutative Law) (Multiplicative Distributive Law) (Multiplicative Distributive Law Variation (4)).

Subtraction: (basic properties of subtraction) (approximate number).

Division: (basic property of division) (invariant property of quotient).

This is one of the most common math calculation problems in elementary school. From the beginning of students' contact with computing, the idea of simple operation is infiltrated from various angles, and in the fourth grade, simple operation is officially presented as an independent question type in the calculation problem, which is the most flexible one of the calculation problems, which can make the flexibility of students' thinking be fully exercised, and will play a very big role in improving students' computing ability. What is simple arithmetic is a very simple question, but in order to understand it correctly, it is absolutely not necessary to perform simple arithmetic for the sake of simple form.

In this regard, my understanding is that simple operation should be flexible, correct and reasonable use of various definitions, theorems, laws, properties, laws, etc., change the original order of operation for calculation, and greatly improve the calculation speed and accuracy through simple operation, so as to make complex calculations simple. That is to say:

The most important thing is to apply various definitions, theorems, laws, properties, and laws flexibly and reasonably. In particular, "flexibility" and "reasonableness" should be emphasized.

I think Xiaohong and Xiaoli read the same book, reading eight pages a day, and after nine days, they each read 72 pages.

8x9 II 72

A: The two of them read 72 pages each.

Xiaohong and Xiaoli read the same stupid Qing disturbance book, 7 days later, how many pages did the two Zhengchun read? Let's say Xiaohong reads 50 pages a day, and Xiaoli reads 60 pages a day.

Xiaohong: 7x50=350 pages Xiaoli: 7x60=420 pages.

A: After 7 days, Xiaohong read 350 pages and Xiaoli read 420 pages.

Xiaohong read 28 pages, Xiaoli read 9 pages, subtract what Xiaoli read with Xiaohong, 28-9 19 pages Xiaohong read 19 more pages than Xiaoli.

Summary. Xiaolei reads a book, reading 8 pages a day, and after reading it for 9 days, there are still 5 pages that have not been read, how many pages are there in this book.

The son wrote it right.

That means that your son has a solid foundation, and this part is mainly to start learning mixed arithmetic, and gradually he will be able to write comprehensive arithmetic. <>

Hello, although our parents look simple, but for children, this is really the beginning of a new mathematical knowledge celebration, so it is not easy. [Hee search key grip hee].

Summary. Pro, the calculation process is as follows: 15+(6-1) 5=40 pages, and I read 40 pages on the 6th day. (15+40) 6 2=165 pages, a total of 165 pages were read in the previous 6 days.

Xiaoli read 10 pages of the book on the first day, and then read 3 more pages every day than the previous day, and how many pages did she read in the first 3 days.

Dear, this question will take about two minutes, and I'll send it to you right away!

Good. Pro, the calculation process is as follows: 10 + 3 = 13 13 + 3 = 16 10 + 13 + 16 = 39 Xiaoli read 10 pages of the book on the first day, and then every day Qi Ji read 3 pages more than the previous day, and a total of 39 pages were read in the first 3 days.

Question 3: How do you do it?

Mr. Zhang. Dear, do you ask how many pages did you read on the sixth day, or how many pages did you read on the first six days?

Dear, the calculation process is as follows: 15+(6-1) 5=40 pages, the 6th day looks at the limbs and guesses the hunger, and the next page is 40. (15+40) 6 2=165 pages, the first 6 days a total of 165 pages were read.

Dear, the above has been sent to you, refresh it and you will see it.

56 8 = 7 (page) demoulding.

8-7=1 (page this fast).

Answer: Xiaoli reads slowly, 1 page a day.

Xiaoli finished reading Lu Sleepy in a few days: 56 divided by 8 = 7 days 8 days 7 days Xiaoli reads fast.

Xiaohong's reading speed: 56 divided by 8=7 pages days 8-7=1 page 1 page per day. Hope.

If you read 9 pages a day for 7 days in a week and finish a book in a week, then the total number of pages in this book is:

9 7 = 63 (pages).

A: The book is 63 pages long.