A five digit number 91 〔 3 〕 can be divided by 6. This five digit number is a difficult problem,

ninety-one thousand and thirty-two

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1. There is a six digit number () 1991 () which can be divided by 44. What is the six digit number?
2. Fill in the appropriate number in so that the six digit number can be divided by 66
3. A six digit a2751b can be divided by 99 to find a and B
4. Six digit 20 () () 08 can be divided by 99, how much is () ()?
5. The six digit a2875b can be divided by 99 to find a and B
6. A five digit 3ab98 can be divided by 99 to find the five digit I really don't understand,
7. 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
8. The area of three sides of a cuboid is 6, 8 and 12 respectively. What is the volume of this cuboid?
9. The cuboid is 12 cm long and 8 cm high. The sum of the areas of the two sides of the shadow is 180 square cm. What is the cuboid's volume in cubic cm
10. Put two cuboids that are 8 cm long, 6 cm long and 5 cm high together to form a large cuboid. How many square centimeters is the maximum surface area of this large cuboid?
11. Fill in the appropriate number in () so that the six digit () 1991 () can be divided by 66
12. 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______ ．
13. 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
14. 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 =?
15. 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)
16. If a three digit ABC is divisible by 3, then () A．a－b＋c B．abc C．a＋b－c D．a＋b－2012c
17. 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
18. 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
19. In the following formula, ABC represents three different numbers in 0-9, so what is the number B? The formula ABC × CBA = acbba
20. In the following formula, the same letter represents the same number ABC + ABC = DDD, finding a = b = C = D=