In a formula, the sum of the two external terms is 37, the difference is 13, and the ratio of the two ratios is 12 / 5

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• 1. 1 / 2, 1 / 3, 1 / 6 and 1 / 4 of the proportion, can group a few on the group a few, the best group a few!
• 2. 12: 13 and 6:4______ ．
• 3. Can 1 / 2 to 1 / 3 and 6 to 4 make up the proportion? 0.6 to 0.2 and 3 / 4 to 1 / 4
• 4. Write two ratios of 0.6, and the composition ratio is______ ．
• 5. A ratio of three fifths is a ratio
• 6. Write two ratios that are 3 / 4 to form a ratio ()
• 7. The ratio of 3.2:0.6 is (); the ratio of 1 / 15:1 / 9 is ()
• 8. The proportion can be made up of 2, 5, 6 and (). The proportion with the largest ratio is () Take a look
• 9. The four numbers 0.26301 are used to form two groups of proportional formulas
• 10. 1. Using 1 / 3, 2 / 5, 25 and 30 as the four items of proportion, how many proportions can you form? Please write out what you can do 2. How many ratios can be made up of 4, 3, 6 and 8? Write them out separately
• 11. The sum of two external terms is 37, the difference is 13, and the ratio is 5 / 6
• 12. In a formula, the ratio of two numbers is 2 / 3, and the two internal terms of the ratio are 12 / 6 and 1 / 6 respectively?
• 13. In a formula, the sum of two external terms is 37, the difference is 13, and the ratio is 5 / 6. The formula can be () Don't solve equations, just formulas and answers, and don't write
• 14. Use 0.25, 3 / 4, 8 and another number to form a proportion, which can be () () () It's the same day
• 15. 0.32 0.4 proportion of a number in the match
• 16. Among the following four groups, the ones that can't form the proportion are () a, 3, 4, 6, 8b, 5, 2, 0.1, 100C, 6, 8, 9 and 10 D. 1 / 6, 1 / 7, 0.6, 0.7
• 17. There are () numbers that can be proportional to 1 / 3,1,9 / 100. Selection: a.0 B.1 C.2 D.3
• 18. There are () numbers that can be proportional to 3 / 5,1,9 / 100
• 19. How many numbers can be proportional to 3 / 5, 1, 9 / 100
• 20. 1.2, 0.9, 1.5, three numbers and () can form a proportion