2.6, 10, 18, and 5 1 are all complex numbers and odd numbers. And coprime.
3. Choose three numbers from 0, 4, 5, 8 and 9 to form a number divisible by 3. The largest of these figures is the smallest.
4. The quotient of A divided by B is 10, the sum of A and B is 77, A is and B is.
The distance a bicycle wheel travels when it rolls forward for two weeks is one meter, the circumference of the wheel is meters, and the diameter is meters.
6. 12 of the 50 cases infected with atypical pneumonia in a certain area were medical personnel, accounting for%. The ratio of infected medical staff to other infected people is.
7. Li Ming bought a 4000 yuan Treasury bill with a fixed term of three years and an annual interest rate of 2.89%. After the expiration, he donated the interest to Project Hope to help poor children. Li donated RMB to Hope Project.
8. The scale of a map of China is 65,438+0: 4,500,000, and it is rewritten as line segment scale. On this map, the distance from Nanjing to Beijing is 20.4 cm, and the actual distance from Nanjing to Beijing is kilometers.
9. The side length of a cubic object is 2 decimeters. Wrap four such objects in paper, at least square centimeters of paper. (Overlap ignored)
10. Put seven red pencils and three blue pencils in a bag, and let you touch 1 at random at a time. Touch 10000 times like this, accounting for about% of the total times. When you touch it, you will probably have a red pencil.
Second, the choice: (7 points)
1. In the following fraction, it cannot be converted into a finite decimal.
①7/28② 13/40③9/25④8/ 15
2. There are more boys than girls, and the ratio of male to female is
① 1:4②5: 1③5:4④4:5
3. In the following question, two related quantities are in direct proportion.
① The perimeter of an equilateral triangle and the length of any side ② The volume of the cone remains unchanged, the bottom and height ③ The side length of the cube remains unchanged, and the volume and bottom area ④ Interest and interest rate.
4. When estimating 7. 18×5.89, the error is small.
①8×6②7×6③7×5④8×5
5. The ratio of expanding the sides of a cylinder into an equal quadrilateral to a rectangle.
① Smaller area and longer weeks ② Equal area and longer weeks.
③ Equal area and smaller circumference ④ Equal area and longer circumference.
6. When using peracetic acid for disinfection, the disinfection water should be prepared according to 1: 200. Now he puts 0.3 kg of peracetic acid solution into 50 kg of water. To make the disinfectant meet the requirements, he should
① Add 0.2kg of liquid medicine ② Pour out 5kg of liquid medicine.
③ Add10kg of water ④ Add 20kg of water.
7. Draw the largest semicircle in a rectangle 5 cm long and 3 cm wide. The circumference of this semicircle is 10 cm.
①9.42② 18.84③ 14.42④ 12.85
Third, judge whether the following statement is correct. (6 points)
1. Add "0" or remove "0" after the decimal point, and the size of the decimal point remains unchanged.
Xiao Ming said, "My cousin was born on February 29th, 1998."
3. The natural number including divisor 2 must be even.
4. Both sides of the corner are line segments.
The product of any two numbers is greater than their quotient.
6. The quantity of A is 25% less than that of B, and the ratio of A to B is 3∶4.
Fourth, calculation.
1, write directly. (5 points)
15×3/20=2/3÷0.5÷2= 13/4+0.25=0. 1÷ 1%=2.5÷5=
2/5÷ 1/ 10=2/3— 1/4=4. 1— 1.3=2.8—4/7+ 1.2=3.5×9+3.5=
2. Find the unknown X. (6 points)
3/5: 12 = 1/2:XX—0. 15X = 8.53 . 6:X = 2/3
3. How to simply calculate the following questions? (12)
(+×)÷÷[×(+)]
(+)×8+4.5—(+ 1.5)—
Verb (abbreviation of verb) application questions (1-9 4 points for each question, 10 9 points for each question)
1. Look at the chart and calculate:
2. A piece of "84" disinfectant packaging paper states: When cleaning the bathtub, the stock solution and clean water should be prepared according to 1: 300. Li Nainai poured out10g of this disinfectant. How many kilograms of water does it take to clean the bathtub? (Use proportional solution)
3. It takes 12 hours for Party A to complete a manuscript alone, and 15 hours for Party B to complete it alone. B typed for five hours first, and A typed the rest of the manuscript. How many hours will it take to finish typing?
4. Aunt Wang's cabinet air conditioner is 0.4m long, 0.2m wide and 1.7m high. In order to prevent dust, Aunt Wang is going to cover this air conditioner with a rectangular cover made of cloth. Please help her figure out how many square meters of cloth is needed to make this cover. (Seam * * needs 0.2 m2 of cloth).
For the sake of students' health and safety, the school provides each student with a water cup, with a 10% discount on each water cup in Sanyuan and Ocean Mall, and "buy eight and get one free" in Baihui Commercial Building. The school wants to buy 180 cups. Please be a "staff officer" and calculate: which is more cost-effective? Please write down your reasons. (5%)
6. Both Party A and Party B walk in the same direction at the same time. Party A walks 100 meters per minute, and Party B walks 120 meters per minute. 12.5 minutes later, the distance between them is150m. How many meters is there between A and B?
7. A rectangular reed mat with a length of12.56m and a width of 3m is enclosed in a cylindrical grain depot with the length as the bottom (not counting the combined consumption). What is the volume of this closed grain depot?
8. A township built a canal. 50% of the total length of the first phase and 35% of the total length of the second phase, leaving 80 meters. How long is this canal around the mountain?
9. Zhangzhuang originally planned afforestation last year 128 hectares, but actually completed the planned afforestation 125%. How many hectares has it actually planted more than planned?
10. Taxi charging standards in a city are as follows: (9)
Mileage cost
3 km and below 8.00 yuan
More than 3 kilometers, one way, each additional 1 km 1.60 yuan.
More than 3 kilometers, round trip, each additional 1 km 1.20 yuan.
(1) Lily takes a taxi from home to grandma's house, paying 17.6 yuan. How many kilometers is it from Lily's house to Grandma's house? (3)
(2) Teacher Wang took a document from the Personnel Bureau 6 kilometers away from the school and went back to school immediately. How can he get a better ride experience? How much do I have to pay for taking a taxi? (6)