The four numbers 2, 3, 6 and 9 can form () proportional expressions

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• 1. Add 9, 1 / 2 and 3 to make these four numbers form a proportional expression. This number is A54 B6 C1
• 2. 1. Use 2 / 9, 3 / 5 and a number to form a proportional expression, which may be () (not innumerable)
• 3. 4 / 3 2 / 1 6 / 1 and 2.25 make up a ratio ()
• 4. 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______ ．
• 5. 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?
• 6. The proportion formula is composed of 3 / 2, 2 / 1, 6 / 1 and 8 / 1
• 7. Use 0.25, 4 / 3, 8 and another number to form a proportion, which can be (three)
• 8. Use 1 / 8, 0.4, 8 and 1 / 2 to form a proportional formula·····
• 9. The ratio of 0.25, 3 / 5, 1 / 8 and 6 / 5
• 10. Write out the two ratios whose ratio is 0.2, and then form the formula
• 11. 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,
• 12. The ratios of the two ratios are 112, and the external terms of their proportional expressions are 14 and 19, respectively______ ：______ =______ ：______ ．
• 13. The ratio is two ratios of three fourths, which make up the proportion Piece by piece
• 14. Write a formula so that the ratio of the two ratios is 1 / 3
• 15. What's the formula of proportion? Use four sum numbers within 20 to form a proportion, and the ratio is equal to 2 / 3?
• 16. 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?
• 17. 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=
• 18. 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
• 19. 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 (): () = (): ()
• 20. According to 7.5 times 2 = 3.75 times 4, the proportion with the largest ratio is ()?