First, fill in the blanks. (Per grid 1 minute, ***24 points)
1.8070kg = () tons 7.2l = () ml.
4 cubic decimeter = () cubic decimeter () cubic centimeter
2、48:( )=( )÷48= =( )%
3.2:5, 12 :0.2, 3 10: 15, one of which is 58: 14 is ().
4. If A×3=B×5, then A:B= (): ().
If X= 57 Y, then X:Y= (): ().
5. Choose four numbers from the five numbers of 6, 24, 20, 18 and 5 to form a ratio:
( ):( )=( ):( )。
6. Choose four divisors of 12 to form a ratio, which can be ().
7. In a proportion, the product of two external terms is the smallest prime number, and it is known that one of the internal terms is ().
8. If the map scale is changed to digital scale, it should be (). If the actual distance between AB's is 100 meter, it should be () cm on the map.
9. In the ratio of 10:3=2:0.6, if the third item is increased by 2, then the first item must be increased by () to establish the ratio.
10, in the proportion, if the two internal terms that make up the proportion are reciprocal and one external term is 2.4, then the other external term is ().
1 1, Nanjing is about 320 kilometers from Shanghai, which is drawn on the map of 1:4000000, and the distance between the two places is () cm.
12. On the map with scale of, 7.2 cm represents () kilometers.
13. There is a rectangular playground with a length of 200m and a width of150m. Draw it on paper in proportion, with a length of 4 cm and an area of () square cm.
Second, the judgment question. (65438+ 0 points for each question, ***5 points)
1, 25 of A equals 27 of B, so A: B =7:5. ………………………………( )
2. The product of two external terms of a proportion is subtracted from the product of two internal terms, and the difference is 0. ………… ( )
3. The circumference and diameter of a big circle must be proportional to the ratio of the circumference and diameter of a small circle. …… ( )
4. The scale of 1: 2000000, namely1cm on the map, indicates that the actual distance is 2 million kilometers. ……( )
5. Two equal proportions can definitely form a proportion. ………………………………( )
Third, multiple choice questions. (65438+ 0 points for each question, ***5 points)
1, 3, 6, 9, 3, plus () can form a proportion.
a、 1 B、2 C、3 D、5
2, and: can form a proportion is ()
a、5:3 B、3:5 C、3 D:
3. Two ratios in the following group () cannot form a ratio.
A, 8:7 and 14: 16 B, 0.6:0.2 and 3: 1.
C, 10: 5 and 14:9 D, 3.5: 7 and 8: 4.
4. The radius ratio of the two circles A and B is 3: 2, so the area ratio of the two circles A and B is ().
a、3:2 B、9:4 C、6:4 D、2:3
5. A precision part with a length of 7.5cm and a width of 6cm is drawn on a drawing with a width of 5cm in Zhang Kuan. The appropriate ratio is ().
a、 1:5 B、5: 1 C、8: 1 D、2: 1
Fourth, the solution ratio. (2 points for each question, *** 12 points)
X:40 = 2.5:4 14:X = 0.4:8 X 3.5 = 40.5
2.8:X= 13 : 120 =79 : X
Verb (the abbreviation of verb) lists the proportion according to the following conditions, and solves the proportion (3 points for each question, 9 points for * * *).
The ratio of 1, 96 and x is equal to the ratio of 16 and 5. 2. Two external items are 24 and 18, and two internal items.
It's x and 36.
3. The left side of the equal sign is the ratio between the smallest prime number and the largest single digit, and the right side is the ratio with X, so find X. ..
Sixth, operational issues. (15)
1. Enlarge triangle A by 2: 1 to get triangle B, and then draw parallelogram C and trapezoid D .(2+2+2 points) with the same area as triangle A.
2. The school has a circular garden with a perimeter of18.84m. Please draw it on paper according to the ratio of 1: 200. (3 points)
3. Measure, calculate and draw pictures as required. The result of the quantity retains the number of whole centimeters. (2+2+2 = 6 points)
The distance from the hospital to the shopping mall in the north of the school (1).
Column calculation:
Xiaoming, a hospital shopping mall, lives upstairs and goes to school.
How many meters is the children's activity center?
0 200 400 600 meter formula calculation:
Proportion:
Xinhua Bookstore is 300 meters south of the shopping mall. Please mark "Xinhua Bookstore" on the map.
Sixth, the application problem. (5 points for each question, ***40 points)
A pesticide and water with a ratio of 1, 1: 20 can control pests and diseases. How many kilograms of this pesticide do you need to prepare 273 kilograms of liquid medicine now? (Column Proportional Solution)
2. On a map, the measured distance from Beijing to Shanghai is 4.2 cm, while the actual distance from Beijing to Shanghai is 1050 km. What's the scale of this map?
3. The rectangular playground is120m long and 90m wide. Please draw a plan of it in the space below with an appropriate scale. Work out its area on the map.
4. On the machine part drawing with the scale of 10: 1, the length of the part is 8 cm and the width is 6 cm. What is the actual length and width of this part?
5. On the map with the scale of 12000, a rectangular experimental field is measured to be 4 cm in length and 3 cm in width. What is the actual area of this experimental field?
6. A cuboid with a base circumference of 40 cm and an aspect ratio of 3: 2. Given a height of 5 cm, how many cubic centimeters is the volume of a cuboid?
7. On the map with scale, the distance between A and B is 20 cm. What is the distance between a and b on the map with scale?
8. Semi-circular flower bed, scale 1: 1000, radius 2 cm. How many square meters is its actual area?