Tứ Đại Tài Tử，11 choose 5 math questions answer sheets

Title: 11 out of 5 math questions answer analysis
Introduction: Mathematics is an integral part of learning and life, and it is essential to improve students’ logical thinking and problem-solving skills. In the process of mathematics learning, mastering certain mathematics problem solving skills is of great significance to improve learning efficiency and academic performance. This article will focus on the theme of “choosing 5 out of 11 math questions for analysis” to help readers better understand relevant math knowledge and master problem-solving skills.
1. Analysis of the first question
Topic: Xiao Ming went to the supermarket and bought three things, how much was the total price? The price and quantity of the items are given as follows: apples are 5 yuan per catty, and two catties are bought; Eggs cost 8 yuan per catty, and I bought three catties; Bananas cost 2 yuan per catty, and I bought four catties. Please calculate the total price.
Answer analysis: First, the total price of each item is calculated based on the known unit price and quantity, and then the total price is obtained by adding the three. That is, the total price of apples is 5 yuan / catty× 2 catties = 10 yuan; The total price of eggs is 8 yuan / catty× 3 catties = 24 yuan; The total price of bananas is 2 yuan / catty× 4 catties = 8 yuan. Therefore, the total price of the three things is: 10 yuan + 24 yuan + 8 yuan = 42 yuan.
2. Analysis of the second question
Topic: Knowing that the length and width of a rectangle are a and b respectively, find the formula for the area and perimeter of the rectangle.
Answer analysis: The formula for the area of a rectangle is length multiplied by width, that is, area = a×b. The formula for the circumference of a rectangle is twice the length of the widening, i.e., circumference = 2×(a+b). With these two formulas, it is convenient to find the area and perimeter of a rectangle with known length and width.
3. Analysis of the third question
Topic: The edge length of a cube fish tank is 6 dm, and the current water filling height is half the length of the edge. Please calculate how many cubic meters of water is in a fish tank? What is the volume of a fish tank? What is the percentage of water area in the fish tank at this time? How is it calculated? Give examples of the thought process. All results are required to retain one decimal place. When calculating the percentage of water area in a fish tank, the results are expressed as percentages. Pay attention to unit conversion! Convert meters to decimeters and calculate them! The edge length is in meters! Other units are decimeters! The conversion process needs to be written! And explain what is the reason for keeping one decimal placebong bóng đôi? The reason and the conversion process need to be specified! Explain every step of the calculation!Chúa Tể Chiến Tranh Pha Lê
Answer analysis: This question mainly examines the calculation method of the volume and surface area of the cube. First, the unit conversion is carried out, and the edge length of 6 meters is equal to 60 decimeters (the reason is that one meter is equal to 10 decimeters). The volume of water is calculated by multiplying the bottom area of the cube by half of the edge length, i.e., 3 decimeters, (edge length multiplied by edge length), to obtain a volume of (6÷10) × (6÷10) × (6÷1) × (half height) = 5.4 cubic metersYGR Điện Tử. The method of calculating the volume of the cube is the cubic of the edge length, that is, the volume is (6÷1), × (6÷1), ×(6÷1) = 216 cubic meters. The percentage of water area in the fish tank area is calculated by first calculating the surface area of the fish tank, subtracting the bottom area, and then dividing by the surface area of the fish tank by 100%. The reason for keeping one decimal place is to better represent the accuracy of the data. Pay attention to unit conversion in the calculation process to ensure the accuracy of the results.
4. Analysis of the fourth question (omitted…… Due to space limitations, it is not possible to analyze all the questions in detail. Readers can answer the questions themselves or seek other resources to help them answer them. In this process, mastering math problem-solving skills and methods is key. Through continuous practice and summarization, I believe that readers will be able to gradually improve their mathematical problem-solving ability. At the same time, it is necessary to be patient and careful in the process of solving mathematical problems, so as to avoid carelessness leading to mistakes. It is hoped that the analysis of this article can help readers better understand the application of methods and skills for solving mathematical problems.