What's the formula of proportion? Use four sum numbers within 20 to form a proportion, and the ratio is equal to 2 / 3?

6:9=12:18

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1. Write a formula so that the ratio of the two ratios is 1 / 3
2. The ratio is two ratios of three fourths, which make up the proportion Piece by piece
3. The ratios of the two ratios are 112, and the external terms of their proportional expressions are 14 and 19, respectively______ ：______ =______ ：______ ．
4. Four numbers are selected from the 10 natural number species of 1 23 4 5 6 7 8 9 10 to form a proportion. The proportion is () Yes (the ratio is the largest) From the 10 natural numbers of 1 23 4 5 6 7 8 9 10, four numbers are selected to form a proportion with the largest ratio,
5. The four numbers 2, 3, 6 and 9 can form () proportional expressions
6. Add 9, 1 / 2 and 3 to make these four numbers form a proportional expression. This number is A54 B6 C1
7. 1. Use 2 / 9, 3 / 5 and a number to form a proportional expression, which may be () (not innumerable)
8. 4 / 3 2 / 1 6 / 1 and 2.25 make up a ratio ()
9. There are arrays {1, 2, 3, 4}, {2, 4, 6, 8}, {3, 6, 9, 12} Then the sum of the four numbers in the 100th array is______ ．
10. 1. Using the five numbers of 2 6 4 8 3 to set up a proportional formula, what can you set up? 2. What's the proportion of 171?
11. 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?
12. 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=
13. 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
14. 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 (): () = (): ()
15. According to 7.5 times 2 = 3.75 times 4, the proportion with the largest ratio is ()?
16. 5 × x = 3.75:4, and the formula with the largest ratio is ()
17. What are the factors of 51
18. What are all the factors of 51? Write all the factors
19. 1 2 3 4 5 12 13 18 20 37 42 51 60 69 83 which of these numbers are combined?
20. 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?