(2-x) square = 16 4 (x + 1) square - 25 = 0 x square - 2x + 1 = 3

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• 1. The teacher wrote 13 natural numbers on the blackboard and asked Xiao Wang to calculate the average (with two decimal places). The answer Xiao Wang calculated was 12.43. The teacher said that the last number was wrong and the other numbers were all right. What's the correct answer? The teacher said that the last number was wrong and all the other numbers were right The average value must be greater than 12.4 and less than 12.5 12.4*13=161.2 12.5*13=162.5 Therefore, the sum of 13 natural numbers is greater than 161.2 and less than 162.5, and they are also natural numbers So the sum of these 13 numbers can only be 162 So the average is 162 / 13 = 12.46 You have a good way to solve it
• 2. The sum of a / B is 162.8. If the decimal point of a is moved one place to the left, it is equal to B. what are the numbers a and B?
• 3. If the sum of a, B and C is 13.23, then a=
• 4. If the sum of a and B is 18.7, the decimal point of a moves one place to the right, which is exactly equal to the number of B, how much is each of a and B Formula
• 5. If the sum of a and B is equal to 18.7, and the decimal point of a is moved one place to the right, it is exactly equal to B, what are a and B?
• 6. The sum of a and B is 18.7, and the decimal point of a moves one place to the right, which is exactly equal to B. how small are the two numbers
• 7. The decimal point of a number is moved two places to the left, then one place to the right, and then 56?
• 8. The decimal point of a number is moved one place to the right, and then three places to the left. The number obtained is 34.56 less than the original number, and the original number is () I see a lot of answers: it's 0.01 of the original number Then 34.65 / (1-0.01) why 1-0.01? (mainly according to your own ideas to say the answer to the question, try to be clear
• 9. The sum of a and B is 56 and 1. If the decimal point of B moves one place to the right, it is equal to A. what is a?
• 10. The sum of the two numbers is 202.4. If the decimal point of one number is moved one place to the right, it is equal to the other number. Then the larger number is 202.4______ ．
• 11. 1.8-2x / X squared - 16, where x = - 2 2. X-2 / 1 + 3 = X-2 / X-1 3 + 2 / x-x = 1 / 2 + X + 1 / 3
• 12. When x = 5, the square of x = 25,2x = 10; when x = what, the square of x = 2x
• 13. What is the square of 2x - 10 Factoring is fast
• 14. 4X + 15 less than or equal to x square + 2x
• 15. X square - 1 / 2x square + 2x + 1-X-1 / 1,
• 16. How to solve the equation x + 1 / 2 + 1 / x = the square of X + 32 / 2x It's 15 in the end
• 17. The square of (x-3) (2-x) (x + 1) (x + 2x + 4) is less than or equal to 0
• 18. When Y-X = 5 x ^ 2-y ^ 2 + 5x + 5Y + 2009 =?
• 19. If the quadratic power of (x-5y-16) + |5y-5x-4 | = 0, then x = (), y = ()
• 20. Factorization of x ^ 2-y ^ 2 + X + 5y-6