7. A cylindrical barrel with an inner diameter of 4 decimeters and a depth of 5 decimeters. Now pour 47. 1 liter of water into the bucket, and the water accounts for ()% of the bucket volume.
9. The annual interest rate of the three-year national debt is 2.4%. If someone buys 1500 yuan's national debt, the maturity interest is * * * () yuan.
2. True or false (mark "√" correctly and "×" wrongly) (5 points)
1. Grade 6 students planted 9 1 plant in spring, among which 9 plants died, and the survival rate was 9 1%. ( )
2. Turn: 0.6 into the simplest integer ratio. ( )
3. Two triangles can be combined into a parallelogram. ( )
When the radius of a circle is doubled, its area is quadrupled. ( )
5. Add 0 or delete 0 at the end of decimal, and the size of decimal will remain unchanged. ( )
Three, multiple choice questions (the serial number of the correct answer in brackets) (5 points)
1, in the following categories, the equation is ().
a、5+x=7.5 B、5+x & gt； 7.5 c, 5+x D, 5+2.5=7.5
A, square b, equilateral triangle c, isosceles trapezoid
2. In the following figures, () has the most symmetry axes.
A, square b, equilateral triangle c, isosceles trapezoid
3.A, B and C are natural numbers, and A× 1 = B× = C ÷, then the smallest number among A, B and C is ().
a、a B、b C、C
4. Cut off a sector with a central angle of 45 on the circle, and the area of the remaining part is () times that of the cut-off part. a、B、8 C、7
There are () pairs of prime numbers in 5.2, 4, 7 and 8. a、2 B、3 C、4
Four, the calculation problem (35 points)
1. Numbers written directly: (5 points)
578+2 16= 18.25-3.3= 3.2- = ×8. 1=
+ = 2 ÷3= 0.99×9+0.99= 2 × =
1 ×8+ 1 ×2= 2 1 ÷7=
2, off-type calculation (can be simplified) (18 points)
①3 -2 +5 - 1
② 14.85- 1.58×8+3 1.2÷ 1.2
③( 1 +2 )÷(2- 1 )
④2.25× +2.75÷ 1 +60%
⑤9.8 1×0. 1+0.5×98. 1+0.049×98 1
⑥ 1000+999-998-997+996+995-994-993+…+ 104+ 103- 102- 10 1
3. Solving equations: (6 points)
2:2 =x:5 1 x- x=6.25
4. Column calculation: (6 points)
What is the quotient of the product of (1)4 minus 1.5 divided by 0.5?
(2) The number A is 18, the number B is 40, and what percentage of the number B is the number A?
Five, find the shadow area in the picture (unit: cm) (5 points)
Six, the application problem (30 points) (1-5 small 4 points, 6-7 small 5 points)
1. A construction team excavated a foundation with a length of 40.5m, a width of 24m and a depth of 2m. The excavated soil weighs 7 tons per 4 cubic meters on average. How many times does a car with a load of 4.5 tons need to be transported?
2. The construction of a section of highway was originally planned to be completed in 50 days for 120 people. After working for a month (calculated as 30 days), 20 people were transferred to repair other sections. How many days will the remaining people have to work more than originally planned to complete the task?
3. Hong Guang primary school teachers and students donated 4000 yuan for the first time and 4500 yuan for the second time. How much is the first donation less than the second donation?
4. To make cylindrical oil drums with iron sheets, the bottom radius should be 6 decimeters, and the ratio of height to bottom radius should be 3: 1. How many square decimetres of iron sheet does it take to make an oil drum like 10? (excluding connectors)
Xinhua Bookstore sent a batch of books, which sold 32% on the first day and 45% on the second day. It is known that 640 copies were sold on the first day, and how many copies were sold in two days?
6. With the cooperation of Party A and Party B, a batch of parts can be completed in 12 days. After several days of cooperation, Party B has something to ask for leave and only completed the general tasks. A went on doing it, and it took 14 days from the beginning to the completion of the task. B how many days did you walk?
7. Two trains leave from Party A and Party B at the same time, and meet at a distance of 48km from the midpoint four hours later. As we all know, the local train is very fast. What's the speed of the express train and the local train? How many kilometers is it between A and B?
Attached reference answer:
1. Fill in the blank: 1, (72005635000) (720); 2、(25:3)(8 ); 3. Omission; 4、(8 )(20); 5、(340)( 1.5); 6、( 18)(4); 7、(75); 8、(95%)9、( 1608); 10、( 15)
2. True or false: 1, ×; 2、√; 3、×; 4、√; 5、√;
Third, multiple-choice questions: 1, a; 2、A； 3、A； 4、B； 5、B；
Fourth, calculation:
1, omitted; 2. The parting calculation ① 5; ②28.2 1; ③7 ; ④3 ; ⑤98. 1; ⑥900
3. Solve equations: 4, 5;
4. Formula calculation: 3,33.3%;
5. Shadow area: 48 square decimeters;
Six, application questions
1 54 (times); 2, 24 (days) 3,11.1%; 4,9023.2 (square decimeter); 5. 1540 (Ben)
6, 5 (days); 7576 (km);