0-9 numbers are filled in the mouth, each number is only used once, mouth ten = mouth ten = mouth ten = mouth + mouth = mouth ten,

1+8=2+7=3+6=4+5=9+0

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1. 0.9:1.3 = 0.9 * (): 1.3 * 10 = (:) number in brackets
2. Xiaoying family has 54 chickens, ducks and geese, of which 49 are chickens. The ratio of ducks to geese is 3:2. How many ducks and geese do they have?
3. There are 63 chickens, ducks and geese in Li Ming's family. The number of chickens accounts for 4 / 9 of the total. The ratio of ducks to geese is two to three. How many are Li Ming's chickens, ducks and geese?
4. Li Ming's family has 56 chickens and ducks, 40 ducks and geese, and 80 chickens, ducks and geese. How many chickens, ducks and geese
5. There are 63 chickens, ducks and geese in Li Ming's family, of which four out of nine are chickens. The ratio of ducks to geese is 3:2. How many ducks and geese are there? It's urgent Homework No Good people help
6. There are 99 chickens, ducks and geese. Ducks are twice as big as chickens. Geese are three times as big as ducks
7. What is the percentage of geese in the total number of chickens, ducks and geese? Chickens: 55% geese: 450 ducks: 30%
8. There are 2500 chickens, ducks and geese in a farm. The ratio of chickens, ducks and geese is 5:4:1?
9. Xiaoming's chickens are 9 times as many as geese, 45 geese. How many more chickens are there than geese?
10. The factory raises 200 chickens and 40 geese. The sum of the number of ducks and geese is exactly 4 / 5 of the number of chickens. How many chickens? Please list the formula
11. What number should be filled in the brackets
12. Fill in 0-9 numbers in brackets. Each number can only be used once () - () = () - () = () - () = () - () = () - ()
13. The following 5 / 7
14. The following brackets are filled with those natural numbers to make the inequality hold. 2 > 13 / () > 4 / 9
15. Inequality 5 / 9
16. What natural number is filled in () below, the inequality holds? 5 / 9
17. Write natural numbers in brackets, which is 4 / 7 of the inequality
18. What should be filled in the brackets?
19. What numbers should be filled in the brackets in number reasoning questions 1, 9, 7, 27, 13, (), 19, 63?
20. Please fill in the numbers 1, 3, (), 15, () in brackets according to your understanding