How to calculate addition, subtraction, multiplication and division is equal to 24

12+13+8-9

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1. It is known that (- 5, Y1), (3, Y2) is a linear function y = - 1 / 3x + 2, and the relationship between Y1 and Y2 is
2. Use 3 4 - 3 - 5 to calculate 24 points
3. It is known that the parabola y = AX2 + BX is tangent to the straight line x + y = 4 in the first quadrant. The area of the figure enclosed by the parabola and the x-axis is denoted as S. find the A and b values that make s reach the maximum value, and find the maximum value of S
4. It is known that the height of a prism with a square bottom is 7cm, and the side length of a square is 4cm. Find the sum of the lengths of all the edges and the surface area
5. Use the words below to make up the right words and fill in the sentences crude 1. At that time, his (attitude) really caused the disgust of many bystanders 2. I have a good look and have a general understanding of the content of the article This is my personal understanding, please advise
6. Use the word "ran" in the following sentences I can't understand what he is singing, but I can't help being surprised to hear such a passionate singing on such a night, and then I begin to respect him. 2. Hakka folk houses and Dai bamboo houses have their own characteristics and different architectural styles. 3. The earth buildings of Hakka folk houses have a history of hundreds of years. They have been shaken by numerous earthquakes, eroded by wind and rain, and attacked by artillery fire
7. Use ran words to form different words and fill in the appropriate sentences below The king of Qin used to exchange 15 cities, but he didn't mention it Cao Cao knew that he had been cheated, and the boat on this side had sailed more than 20 miles with the wind and water. It was too late to catch up
8. After the teacher's comfort, the hearts of the students gradually came down. 2. The primeval forest of () makes people feel creepy. 3. The meeting is about to start, and people are waiting. 4. The court must keep (), otherwise the trial will not go smoothly. Thank you!
9. 8 is the arithmetic square root of (- 8) square, right
10. Which basic logic structure does the conditional statement belong to
11. How to find the partial derivative of X to the power of X to the power of Y I'm not very good at finding partial derivatives for X and y, but I always get a small part Z = x ^ x ^ y finding partial derivatives of X and Y
12. Given x = 84, y = 2.56, find x + Y-2 radical XY / radical x-radical y,
13. As shown in the figure, three rectangles of the same size just make a square. The perimeter of the square is 48 cm. Find the perimeter of each rectangle In the following figure, three rectangles are stacked horizontally
14. Division of rational numbers There are two ways to divide rational numbers 1. Divided into integer and fraction 2. Divided into positive rational number, 0, negative rational number Title: Can you make your own standard to classify rational numbers in another way? We often classify things in our life. Please give an example I'll wait online!
15. What is the rule of comparison of rational numbers?
16. The formula of addition and subtraction of rational number in grade one mathematics of junior high school!
17. Mainly to the first day of the calculation problem ~ to have add subtract multiply divide power~
18. 3-What fraction is zero?
19. How many parts is 0.625 times one third
20. What fraction is equal to 0.625 is equal to 48 is equal to 25 divided by what