2. Party A and Party B each process a batch of parts, and Party B takes 2 hours longer than Party A to complete the task ... If A produces 150 pieces first, then B starts production. B to complete the task, A can exceed 90 yuan. B's work efficiency is four-fifths of that of A. How much does B do per hour?
3. There are two piles of balls in A and B. A has more balls than B, and the number of balls in A is between 130-200. Take as many balls from pile A as pile B and put them in pile B, then take as many balls from pile B as the rest of pile A and put them in pile A. After five moves, there are as many balls in pile A and pile B, so how many balls are there in pile A?
4. In an aquatic plant with a length of 24 decimeters, a width of 9 decimeters and a height of 8 decimeters, inject a sleep with a depth of 4 decimeters, and then put it into a cubic iron block with a length of 6 decimeters. How many decimeters does the water surface rise?
5. Fold the angle C in the right triangle ABC in half, so that the point C coincides with the point A. If AB=3 and BC=4, what is the area of the ABED of the quadrilateral (see the figure below, please save it on the desktop).
For a project, it takes 15 days for Team A to do it alone, and 20 days for Team B to do it alone. How many days does it take for two teams to work together?
seven
For a job, Party A will do it for 6 hours, Party B for 4 hours and Party C for 3 hours. How many hours does it take for three people to work together?
A project is completed by Party A alone within 9 days. After A works alone for four days, how many days does it take for B to cooperate with A?
A project will be completed within 65,438+00 days. After Party A and Party B worked together for eight days, it took Party B five days to finish the project. If Party B works alone, how many days will it take?
10 The original 1/5 students 1 took part in the cleaning, and then two students took the initiative to take part. The actual number of participants was 1/3. How many students took part in the cleaning?
1 1 In a knowledge contest, there are 25 questions * * *, and each question has four answers, of which only 1 answer is correct. Ask students to choose the correct answer, with 4 points for each question, and 2 points for not choosing or wrongly deducting. If a student scores at least 60 points in this competition, he should at least choose.
12 What is the value of the algebraic expression 2x-y/ 10xy when 2x-y/5xy=2? What is the value of the algebraic expression 15xy/6x-3y?
13 When x+y= 15 and xy=-5/5 1, find the value of the algebraic expression 6x+5xy+6y.
14 the original price of a TV set in a shopping mall was 2500 yuan, and now it is sold at a 20% discount. If the sales before and after the price reduction is 654.38 million yuan, how much should the sales increase?
15 The purchase price of a product of a dealer is 1050 yuan, and the list price is 150% of the purchase price. If he wants to get a profit rate of not less than 20%, then he can at least get a discount. Please help him design it.
Play 2 1 point 16: Select four cards from a deck of playing cards (excluding King and Xiao Wang), and perform mixed operation according to the numbers on the cards (each card can only be used once), so that the operation result is 2 1 or -2 1, where red playing cards represent negative numbers and black playing cards represent negative numbers.
One third of a number is 8 less than two fifths of it. What are three quarters of this figure?
18 The water consumption per user shall not exceed 10 ton, and the water fee per ton shall be 0.8 yuan. If it exceeds 10 ton, the water fee will be increased by 50% on the basis of each ton of 0.8 yuan. Xiaohong used water 18 tons last month. How much is the water fee?
Store 19 sells large, medium and small balloons, with large balloons per 3 yuan, medium balloons 1.5 yuan and small balloons 1 Yuan. Teacher Zhang bought 55 balloons with 120 yuan * *, of which the money to win balloons was just as much as the money to buy small balloons. How many balls did you buy?
A shopping mall buys 500 sets of children's clothes, each set is bought in 50 yuan, and the price is increased by 60%, which is sold as the sales price.
1. How much profit can I make if I can sell them all?
2. When the children's clothes were sold to 80%, due to seasonal changes, the store decided to give them a 50% discount, 15%. The last 5% is sold at a 60% discount. How much money did this shop make in this business?
2 1 sector area formula s=nπrr/360
Let the radius of the circle be r, and the radius of this sector be 2r.
Get nπ2r2r/360=πrr/2.
Get n = 45.
There are 48 students in one class. 12 likes football, 22 likes basketball, 8 likes table tennis and the other 6. Find out their percentage.
There are two white balls and two red balls in the bag, and the number of balls does not change. How can I feel that the number of red balls is one sixth?
A truck travels 35 kilometers per hour from A to B. After 40% of the journey, a car travels 45 kilometers per hour from B to A. After the car leaves for 3 hours, it meets the truck. What's the distance between a and b?
Cut a square with a length of 8 cm into two identical small rectangles. The sum of the surface areas of the two small rectangles is () square centimeters more than the original cube, and the volume of each small cuboid is () cubic centimeters.