The divisor of 7.18 is "and four divisors in the number are selected to form the proportion of" 7.18 "

The divisor of 18 is "1,2,3,6,9,18". Choose four divisors and make them into "18:9 = 6:3"

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1. The factor of 18 is______ From which four numbers are selected to form a proportion______ ．
2. The factor of 18 is______ From which four numbers are selected to form a proportion______ ．
3. The factor of 18 is______ From which four numbers are selected to form a proportion______ ．
4. Use the four divisors of 18 to form a proportion (write at least 2 zeros) I'm in a hurry
5. The factor of 18 is______ From which four numbers are selected to form a proportion______ ．
6. The divisor of 48 is______ Let's decompose 48. The prime factor is______ ．
7. Decompose 12 into prime factor () and there are () divisors of 12
8. The factor of 24 is______ Four factors are selected to form a ratio, and the largest ratio is______ ．
9. Four numbers are selected from the divisors of 36______ ：______ =______ ：______ ．
10. There is a number, which is not only a divisor of 45, but also a multiple of 45. This number is______ Let's decompose this number. The prime factor is______ ．
11. A three digit number, which contains the divisor 2, is a multiple of 5, and can be divided by 3. The minimum number is (), and the prime factor is ()
12. Two questions: one question: a number is not only a multiple of 21, but also a divisor of 21. What is the number? What is the prime factor when it is decomposed? The second question: a natural number divided by 2, 3, 4, 5, the result is more than 1, how many such numbers? What is the smallest?
13. The maximum factor of a number is 36, and the number is______ All of its factors are______ The minimum multiple of this number is______ ．
14. The minimum multiple of the greatest divisor of a number is 21. This number is 21. If we decompose it into prime factor, it is
15. A number is not only a multiple of 24, but also a divisor of 24. The prime factor of decomposition is () fast
16. The divisor of 24 is______ We decompose 24, and the prime factor is______ ．
17. A = 2 × 3 × 5, B = 2 × 5 × 7, the greatest common factor of a and B is______ The least common multiple is______ ．
18. A = 2 * 3 * a, B = 3 * 5 * B, the greatest common divisor of a and B is 15, and the least common multiple of a and B is?
19. The number a is 24, the least common multiple of a and B is 168, the greatest common factor is four, what is the number B?
20. The number a is 24, the least common multiple of a and B is 168, and the greatest common divisor is 4?