1. Divide the eight numbers 1, 2, 3, 4, 5, 6, 7 and 8 into three groups, and calculate the sum of each group. Given that the three sums are not equal to each other, and the maximum sum is twice the minimum sum, what is the minimum sum? 2. A four digit number is composed of non-zero even digits, which is just the square of the number composed of two even digits? Those who can do more work, those who have nothing to do, please don't talk nonsense!

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• 1. How to compare the size of two numbers in unit 6 of grade 6 of primary school mathematics
• 2. Which group of four numbers can make up the proportion? Write out the proportion (1) 1.2, 8, 9 and 60 (2) three fifths, 0.5, 10 and 0.3 (3) 1 / 3, 1 / 6, 1 / 2 and 1 / 9 (4) 4, 12, 5 and 15
• 3. Sixth grade mathematics Olympiad! Urgent! 1. My mother bought some apples. She ate 1 / 3 and 1 / 3 apples on the first day, left 1 / 4 and 1 / 4 apples on the second day and left 1 / 3 and 1 / 3 apples on the third day. How many apples did she buy 2. In a school, the fourth grade is 25% more than the third grade, the fifth grade is 10% less than the fourth grade, and the sixth grade is 10% more than the fifth grade. If the sixth grade has 38 more people than the third grade, how many people are there in the third, fourth, fifth and sixth grades? 3. Vehicle a and vehicle B leave from ab at the same time. After meeting, vehicle B arrives at a in 5 hours. However, vehicle a exceeds B by 90km, 25% of the whole journey
• 4. Mathematical Olympiad in grade six of primary school 1. In the first 50 natural numbers, arbitrarily take two different numbers and add them together. How many different ways are there when the sum is even? 2. Only brackets, addition, subtraction, multiplication and division can be added. Write a formula with the number of 3, 3, 8 and 8 and the result is 24 Thank you for your answer. Could you be more specific in the first question?
• 5. Think about it: can you use the four numbers 2.8.0.2.7.0.5 to form different ratios? Write at least four groups of ratios
• 6. 4 0.125 2.58 make these four numbers into different proportions (only two groups)
• 7. Judgment: four ratios can be made up of three, four, six and eight
• 8. Select four numbers from 3 / 8, 3 / 4, 1.6/7 and 0.8 to form the proportion ()
• 9. 2. 3, 4 and 5 make up a number. Each number can only be used once. What is the largest number? (hint: power operation is allowed, and 5432,42 ^ 53. Please use "^" for power calculation, such as 2 ^ 8 for the 8th power of 2.)
• 10. The largest number is 2, 3, 4, 7 and 5______ The minimum number of components is______ ．
• 11. Use 1 / 8,5,1 / 2,20 to form a proportion, and make the ratio of the two ratios equal to 1 / 4. The proportion formula is ()
• 12. Among the numbers 2, 3, 6, 8 and 16, the proportion of four numbers is ()
• 13. Can 1 / 2, 1 / 5, 5 / 8 and 1 / 4 form a proportion
• 14. 2.3.6.8.16 select four components
• 15. 25 cm: 12 km=______ ：______ =______ 450 G: 12 kg=______ ：______ =______ 5:00: 1:40=______ ：______ =______ ．
• 16. The two external terms of a ratio are 2.4 and 40 respectively, and the ratio is 1 and 1 / 2. The ratio is 1
• 17. A ratio consisting of four different numbers, and the ratio of the two ratios of the ratio is two fifths
• 18. The ratio of two ratios is 2 / 3. If you know that the difference between the front and back terms of the first ratio is 6, and the sum of the front and back terms of the second ratio is 40, write down the ratio of the two ratios
• 19. 1. Write two ratios that are two fifths and make up the proportion. 2. Make up four proportions with four numbers: 4, 10, 16 and 40 Write four ratios according to 4.5 × 1.6 = 9 × 0.8
• 20. Add a number is it and 3.5.8 together to form three different proportions to write out! Add a number is it and 3.5.8 together to form three different proportions to write out!