2.5 1 class has 50 story books, twice as many as 4 art books. How many art books are there?
3. A triangular plot with an area of 280 square meters, a bottom of 80 meters and a height of several meters?
4. The area of a trapezoid is 450 square meters, the height is 30 meters, the upper bottom is 15 meters, and the lower bottom is how many meters?
There are 80 sheep on the hillside, among which the number of white sheep is four times that of black sheep. How many black sheep and white sheep are there on the hillside?
6. Two baskets of oranges were sold in the shop. The first basket weighs 26 kilograms and the second basket weighs 29 kilograms. The second basket sold 9 yuan more than the first one. What is the average price of oranges?
7. A trapezoidal wheat field with an area of 540m2, a height of18m, an upper bottom of 20m and a lower bottom of several metres?
8. Two cars, A and B, leave from two places 750 kilometers apart at the same time, face to face, and meet in five hours. Car A travels 80 kilometers per hour, and how many kilometers does car B travel per hour?
9. Two cars leave from the same place at the same time. After driving for 4.5 hours, car A lags behind car B 13.5 km. It is known that car A travels 35 kilometers per hour. How many kilometers does bus B travel per hour?
10, processing a batch of parts, with the cooperation of Party A and Party B for 5 hours, and Party A making 9 forms independently. It is known that A processes 2 more parts per hour than B. How many parts are there in this batch?
1 1, the stadium bought 16 basketball and 12 football, and * * * paid 760 yuan. It is known that the unit price ratio of basketball and football is 5: 6. How much does the stadium pay for basketball and football?
12. A store bought a batch of leather sandals, and the price of each pair was higher than the purchase price 15%. If you sell them all, you can make a profit 120 yuan; If you only sell 80 pairs, you can't go to 64 yuan. What is the purchase price of leather sandals?
13. Master Zhang will make a cylinder with two pieces of iron sheets (see the picture below), choose one of them to cut out two bottoms, and then use the other piece as the edge. The volume of the cylinder is required to be as large as possible, so what is the surface area of the cylinder made by Master Zhang? What is the volume? (regardless of the joint, π is φ 14)
14, A walks from Dongcheng to Xicheng at 5 kilometers per hour, and B walks from Xicheng to Dongcheng at 4 kilometers per hour. If B goes before A at 1, then they meet right in the middle of the two cities. What's the distance between east and west?
15, an operating company has two warehouses to store color TV sets, and the storage ratio of warehouse A and warehouse B is 7: 3. If 30 sets are transferred from warehouse A to warehouse B, the ratio of warehouse A to warehouse B is 3: 2. How many TV sets were originally stored in these two warehouses?
16. When the express train from city A to city B needs 10, and the slow train from city B to city A needs 15, two cars leave from two cities at the same time. When they met, the express train ran more than the local train 120 km. How many kilometers are the two cities apart?
17, 5 tractors for 24 days 12000 mu. /kloc-how many tractors do you need to plow 54000 mu in 0/8 days?
18, square banana garden, side length 84m, banana trees spacing 2m, row spacing 8m. If each banana tree receives 65 kilograms of banana fruit at 0.45 yuan per kilogram, how much can this banana garden earn a year?
19, the transportation rate of Dongfeng brand trucks is 2.5 times that of tractors, and the transportation rate of large container trucks is Dongfeng brand trucks.
Triple, there is a pile of goods, transported by Dongfeng truck for six hours. If tractors are used to transport half of them,
How many hours does it take to transport the other half in a big truck?
20. Both parties sell eggs. Party A has more eggs than Party B 10, but the income after all eggs is 15 yuan. If Party A sells eggs at Party B's price, they can be sold to 18 yuan. How many eggs do Party A and Party B have?
1.2 100-2 1×53+2255
2.( 103-336÷2 1)× 15
3.800-(2000-9600÷8)
4.40×48-( 1472+328)÷5
5.(488+344)÷(202- 194)
6.2940÷28+ 136×7
7.605×(500-494)- 1898
8.(2886+66 18)÷(400-346)
9.9 125-( 182+35×22)
10.( 154-76)×(38+49)
1 1.3800- 136×9-798
12.( 104+246)×(98÷7)
13.9 18÷9×( 108-99)
14.(8645+40×40)÷5
15.(2944+864)÷( 1 13-79)
16.8080- 1877+ 188 1÷3
17.(50 1 1-43×85)+3397
18.2300- 1 122÷(2 1- 15)
19.8 16÷(4526-25 1× 18)
20.(7353+927)÷(80 1-792)
2 1.(28+ 172)÷(24+ 16)
22.6240÷48+63×48
23.950-28×6+666
24.86×(35+ 1 17÷9)
25.2500+(360- 160÷4)
26. 16×4+6×3
27.39÷3+48÷6
28.24×4-42÷3
29.7×6- 12×3
30.56÷4+72÷8
1. If there are five Fridays in May of a certain year and the sum of their dates is 80, what are the 5th and 7th of this month? If today is Monday, what day will it be after 2008? (Equation solution) 3. The sum of two digits is 9. If you add 2 to each number, the number you get is five times less than the original number. Find this two-digit number (solved by equation) 4. There is a six-digit number, and the last three digits are 857. After multiplying this six-digit number by six, the first three digits and the last three digits are just exchanged, and the original six digits are found (solved by equation) 5. In order to strengthen the power of citizens. Please refer to the price list for the charging price of tap water in this city. The monthly water consumption unit price shall not exceed 6 cubic meters. 2 yuan/m3 not exceeding 6 m3 not exceeding 10 m3? 4 yuan /m3 exceeds 10 m3 8 yuan /m3 Note: a household used 8 m3 in June, 5438+ 10, and the water receivable is 2× 6+4× (8-6) = 20 yuan (1). If the household used water 12.5 m3 in February, and the water charge receivable was () yuan (only write the answer but not the process) (2) If the household used water15m3 in March and April (the water consumption in April exceeded that in March), how many cubic meters did the household use in March and April? (Equation solution) 1. A bookstore can still make a profit of 20% if it sells a new book for one hour at a discount of 10% of the list price. If the bid for the book is 2 1 yuan, what is the bid price? (Equation solution) 2. If a commodity is sold at a 20% discount on the basis of the original price, it is deemed to be profitable at 20%. What percentage of profit can it make if it is sold at the original price? 3. If the purchase price of a mobile phone is 1500 yuan, and the shopping mall decides to increase the purchase price by 50% before the price is marked, what is the price? A customer bought a mobile phone with a 30% discount coupon on the list price. How much did he actually pay? How much profit can the mall make? A passenger took 30 kilograms of luggage from Nanjing to Tianjin by plane. According to the regulations of the General Administration of the People's Bank of China, passengers can take up to 20 kilograms of luggage, and the overweight part is purchased at 65,438+0.5% of the ticket price per kilogram. Now the passengers have bought the baggage ticket for 120 yuan. What is its ticket format? (Equation solving)