Bound exercise books, 30 books are 40 cm thick, ask how many centimeters after 50 exercise books

Four-thirds.

Four-thirds 50 = 66 and two-thirds.

Centimeter. 17,000,000 centimeters = 170 kilometers.

b = 2c4 4c vs. 4 2c vs. c = 4 vs. 2 vs. 1

4c vs. 2c vs. c = 16 vs. 4 vs. 1

1. If you know that 30 books are 40 cm thick, you can calculate the thickness of each exercise book 40 30 cm; Then you can calculate how many centimeters thick 50 books. Namely:

40 30*50 = cm (keep 2 decimal places).

5000000=: The actual distance from Shanghai to Hangzhou, according to the product of two foreign terms equal to two internal terms, can be obtained:

The actual distance from Shanghai to Hangzhou = 5000000 * 000 000 cm = 170 km.

3. Is there a missing condition for this question? a-2b+c=a+b+c-3b=86-3b

4. Assuming c=1, then b=2c=2, a=2b=4, then the ratio of the circumference of the three squares is 4*4:2*4:1*4=16:8:4=4:2:1;

The ratio of the area of the 3 squares is: 4*4:2*2:1*1=16:4:1

30*40= ——50=36cm

2.5000000cm = 50 km 50 * km.

3.It's a bit hard.

4 .Circumference a:b:c=1:2:4 Area 1:4:16

1 All 38 100 = cm).

The average thickness of each exercise book is centimeters.

If each book is 40 pages, it can be bound x book 40x = 30 500x = 375

Analysis: The number of pages in a batch is constant, and when the number of pages in the bound exercise book increases, the number of exercise books decreases, and vice versa. Then the number of pages in the bound exercise book is inversely proportional to the number of books.

Solution: If each book is 45 pages, it can be bound x copies.

45x=40*180

45x=7200

x=160A: If each book is 45 pages, 160 copies can be bound.

Solution: If each book is 45 pages, it can be bound x copies.

The number of pages is inversely proportional to the number of pages in the book.

45x=40*180

45x=7200

x=160A: If each book is 45 pages, 160 copies can be bound.

If each book has x pages, then there are 240x=20 300,240x=6000,x=25;

A: If you want to bind 240 copies, each book has 25 pages

500x20=10000, find the total number of pages, 10000 400=25 pages.

A: Each book is 25 pages.

Solution: It is known that a batch of paper is bound into an exercise book, each with 36 pages, and 40 books can be bound, then this batch of paper has a total of: 36 40 = 1440 pages, if each book is less bound than 4 pages, then each book has 36-4 = 32 pages, then it can be bound = 1440 32 = 45 books.

A: It can be bound in 45 copies.

Equation: 36 40 (36-4).

45 copies.

36×40÷（36-4）

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