Use each of the nine numbers 1 to 9 to form three three digit numbers divisible by 9. The sum of the three numbers should be as large as possible. What are the three numbers______ ．

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• 1. Fill in the appropriate number in () so that the six digit () 1991 () can be divided by 66
• 2. A five digit number 91 〔 3 〕 can be divided by 6. This five digit number is a difficult problem,
• 3. There is a six digit number () 1991 () which can be divided by 44. What is the six digit number?
• 4. Fill in the appropriate number in so that the six digit number can be divided by 66
• 5. A six digit a2751b can be divided by 99 to find a and B
• 6. Six digit 20 () () 08 can be divided by 99, how much is () ()?
• 7. The six digit a2875b can be divided by 99 to find a and B
• 8. A five digit 3ab98 can be divided by 99 to find the five digit I really don't understand,
• 9. The length, width and height of a cuboid are a, B and C meters respectively. If the height increases by 2 meters, and the length and width remain unchanged, the volume of the new cuboid will increase () A. A×B×（C+2）B. 2ABC. 2ABC
• 10. The area of three sides of a cuboid is 6, 8 and 12 respectively. What is the volume of this cuboid?
• 11. If three digits of a three digit number are a, B and C respectively, and (a + B + C) can be divisible by 9. Verification: the three digit number must be divisible by 9 thank
• 12. If there is a 1994 digit a divisible by 9, the sum of its digits is a, the sum of its digits is B, and the sum of its digits is C, then C =?
• 13. If the three digits of a three digit number are a, B and C respectively, and (a + B + C) can be divided by 9, prove that the three digit number must be divided by 9 The answer is this: if these three numbers are a, B and C, then the value of three digits is 100A + 10B + C = 99A + 9b + (a + B + C), where 99A, 9b and (a + B + C) can be divisible by 9, so this three digit must be divisible by 9 But I don't understand. Please explain in detail, I just don't understand why a + B + C becomes 100A + 10B + C = 99A + 9b + (a + B + C)
• 14. If a three digit ABC is divisible by 3, then () A．a－b＋c B．abc C．a＋b－c D．a＋b－2012c
• 15. ABC is a three digit number. It is known that 2A + 3B + C can be divisible by 7. It is proved that this three digit number can also be divisible by 7
• 16. A three digit number is represented by ABC. It is known that it can be divided by 2.3.5 and a + C = 8. What is the three digit number? What's the formula
• 17. In the following formula, ABC represents three different numbers in 0-9, so what is the number B? The formula ABC × CBA = acbba
• 18. In the following formula, the same letter represents the same number ABC + ABC = DDD, finding a = b = C = D=
• 19. (abc+bca+cba)(a-c+b)=
• 20. In (acute) triangle ABC, angle c = 90 degrees, angle CBA = 30 degrees, BC = 20 √ 3. (1) find the length of BC (2) A circle with a radius of 6 moves to the right at the speed of 2 unit lengths per second. During the movement, the center of the circle is always on the straight line ab. Q: how many seconds does the circle tangent to the straight line on one side of the triangle ABC