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1. Analysis: The distance on the graph and the actual distance are known, and the scale of the diagram can be found according to the "scale bar = distance on the diagram and the actual distance".

Answer: Solution: Since 8 mm = cm, then 16 cm: cm = 20:1, so the scale of this picture is 20:1;

So the answer is: 20:1

Comments: This question examines the significance of the scale, and pays attention to the unity of the units

3m=1/2n

m=3/4n

m/n=3/4

m:n=3:4

3. The distance traveled by the passenger car in 3 hours is equal to the distance traveled by the car in 4 hours. The speed ratio of passenger cars to cars is (4:3).

4. Analysis: The amount used every day now = the amount of raw materials shared now, first find the amount used in 10 days, and then divide these raw materials into 6 days equally, which is the original daily amount; The amount per day that used to be - the amount that is now per day = the amount saved per day

Answer: Solution: 18 10 6-18

12 (t);

A: This plant now saves 12 tons of raw materials per day compared to the past

Comment: There is such an equivalence relationship in this question: the original amount used per day The original number of days = the amount used now every day The number of days used now

1 8 mm: 16 cm = 8 mm: 160 mm = 8: 160 = 1: 20

2 m：n=1/2:2/3=3:4

4 18 6 10 = tons tons.

1.The length of a teaching building is 80 meters, the width is 24 meters, and the floor plan of this teaching building is drawn according to the scale of 1:800.

1) The length of the drawing is (10) cm, and the width is (3) cm.

2.Mr. Zhang immersed a stone in a cylindrical container with a circumference of centimeters at the bottom and a height of 10 centimeters for the jujube, and the water surface rose by centimeters to find the volume of the stone.

radius in centimeters. Volume cubic centimeters.

(1) From the Baicao Garden to the Sanwei Study, the Five Rampant Societies are impermanent.

2) Warm memories: [Example 1] The article "From Baicao Garden to Sanwei Study" describes the scene of children catching birds on the snow in Baicao Garden. Example 2: In the article "Five Rampant Meetings", during the Greeting Tournament, the children bought a "Blowing Dudu" and blew it for two days to enjoy the joy of a game.

Example 3] In the article "Impermanence", Impermanence sees a mother crying for her dead son and letting her son return to the sun for a while.

Critique of Truth: [Example 1] In the article "From the Hundred Herb Garden to the Three Flavors Book House", the teacher asks the children to read some boring books. 【Example 2】Before going to the game in the article "Five Rampant Meetings", my father forced me to endorse the book, which made me feel disappointed and painful.

Example 3] In the article "Impermanence", people cannot find justice in real life, but are asked to seek a fair judgment in the underworld.

A cube of iron with a 20 cm edge is fused and cast into a conical iron block with a bottom diameter of 30 cm. What is the approximate height of this conical piece of iron? (The number of whole centimeters is retained).

The volume of the iron block is.

20 20 20 8000 (cubic centimeters).

The radius of the base nucleus height of the cone is.

30 2 15 (cm).

The base area of the cone is.

15 15 square front centimeters).

The height of the cone is approximately.

8000 3 cm).

2.Find the area of the shaded part. The radius is.

The area of the shaded part The area of the semicircle The area of the triangle is changed to the area of the ruler.

l=4 20 40=8 (cm grinding socks).

The volume is calculated and then divided by the cross-sectional area to get the length.

The format will not be cloth (* I hope that the debate tour rental will help you.

At 5 o'clock on the clock face, the smaller angle of the hour hand and the minute hand is the (acute) angle, which has (150) degrees.

The ratio of the base area of a cone to a cylinder is 2:1, the volume is equal, and the ratio of the height of the cone to the cylinder is (2:3).

A cylindrical pool with a diameter of 3 meters at the bottom, a circumference of ( ) meters and an area of ( ) square meters.

A cylinder, if sawn in two sections parallel to the bottom surface, increases the surface area by square decimeters, and if sawn into two identical pieces along the diameter of the bottom surface, the surface area increases by 8 square decimeters. What is the volume of a cylinder in cubic decimeters?

Solution, obtain: the bottom area of the cylinder is: square decimeters.

The diameter of the bottom surface of the cylinder is: decimeters.

The height of the cylinder is: 8 2 1 = = 4 decimeters.

So the volume of the cylinder is: cubic decimeters.

6×3-（3²×

1) Tall pairs of buildings are like short pairs (stakes).

2) Diligence is to success as laziness is to failure.

3) Pride is to backwardness as humility is to progress.

4) Hard to rocky as soft to (sandy).

5) Sunny days are as dry as rainy days are good (wet).

Subtract the area of a semicircle from the area of the rectangle.3 6 1 2(2, (1) tall to a building, like a dwarf to a tree stump.

2) Diligence is to success as laziness is to failure.

3) Pride is to backwardness as humility is to progress.

3) Hard to rock, as soft to soil.

4) Sunny days are to dryness what rainy days are to humidity.

3. Sparkling.

The area of the circle s= r = because it is a semicircle, so divide by 2 equals.

Shaded area = rectangular area - semicircle area = (3*6).

Hello: (6 2- *5 2) * 80 = cubic centimeters.

Hope it helps].

First, if the naughty age is x, then the old man's age is 7x, 8x=88, x=11. Second, if the total number of people is x, then boys and girls, x=300. Three: 480*20%-480*20%=0, no profit or loss.