1 2 3 4 5 12 13 18 20 37 42 51 60 69 83 which of these numbers are combined?

4、12、18、20、42、51、60、69

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1. What are all the factors of 51? Write all the factors
2. What are the factors of 51
3. 5 × x = 3.75:4, and the formula with the largest ratio is ()
4. According to 7.5 times 2 = 3.75 times 4, the proportion with the largest ratio is ()?
5. The ratio of the two ratios is 3 / 2. The external terms of the formula are 1 / 4 and 1 / 9 respectively. The ratio is (): () = (): ()
6. The ratio of two ratios in a formula is equal to 4. The two external terms of the ratio are 8 and 9. What is the formula
7. The ratio of the two ratios is one and one-half, and the two external terms of their 9-scale formula are one fourth and one-fifth respectively. The formula is "if three" The ratio of the two ratios is one and one-half, and the two external terms of their 9-scale formula are one fourth and one-fifth, respectively? If two-thirds a equals one-quarter B, then a: B=
8. The ratios of the two ratios are 1:1 and 1:2, and the external terms of their formula are 1:4 and 1:9 respectively?
9. What's the formula of proportion? Use four sum numbers within 20 to form a proportion, and the ratio is equal to 2 / 3?
10. Write a formula so that the ratio of the two ratios is 1 / 3
11. 1 2 3 4 5 12 13 18 20 37 42 51 60 69 83 Where are the multiples of 2,3,5 at the same time?
12. Divide 18 21 27 26 51 33 3 62 71 7 45 41 72 11 into prime number and factor respectively
13. In 1,2,4,5,13,14,15,19,20, the odd number has (), the even number has (), the prime number has () and the composite number has (), which is both the composite number and the composite number Even numbers have ()
14. What are odd numbers 1, 5, 7, 52, 16, 120, 19, 35, 97, 11, 80? Which are odd, even, prime, composite?
15. In 1.5, 5, 0, 18, 19, 80, 51 and 2.4, integers have______ Prime numbers have______ The existence of both odd and composite numbers______ ；______ Yes______ The divisor of
16. In 1.5, 5, 0, 18, 19, 80, 51 and 2.4, integers have______ Prime numbers have______ The existence of both odd and composite numbers______ ；______ Yes______ The divisor of
17. 18 and 1 / 4 * (1-54 / 59) - 17 and 1 / 4 △ 11 and 4 / 5 Simple calculation
18. The simple calculation of 68 * 32 / 34 + 789 is 52 * 84 + 17 * 52 - 52 It is a simple calculation of 68 * 32 / 34 + 789 and 52 * 84 + 17 * 52 - 52
19. Simple calculation of 5.68 × 4 + 4.32 △ 0.25
20. Simple operation: 15.32 * 4 + 4.68/0.25