In the following, fill in 1, 2, 3, 4, 5, 6, 7, 8 and 9 (the number in each formula cannot be repeated, and the numerator of fraction part is less than denominator), so that the value of formula a with fraction is the largest and that of formula B is the smallest

(1) 98745-1236, 12469 + 3578 and 12469 + 3578

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1. Put the seven numbers 0, 1, 2, 3, 4, 5 and 6 in the square of the circle. Each number appears just once to form an integer with only one or two digits. What is the number in the square? ○×○=□=○÷○
2. Put the seven numbers 0, 1, 2, 3, 4, 5 and 6 in the square of the circle. Each number appears just once to form an integer with only one or two digits. What is the number in the square? ○×○=□=○÷○
3. Put the seven numbers 0, 1, 2, 3, 4, 5 and 6 in the square of the circle. Each number appears just once to form an integer with only one or two digits. What is the number in the square? ○×○=□=○÷○
4. Put the seven numbers 0, 1, 2, 3, 4, 5 and 6 in the square of the circle. Each number appears just once to form an integer with only one or two digits. What is the number in the square? ○×○=□=○÷○
5. Put the seven numbers 0, 1, 2, 3, 4, 5 and 6 in the square of the circle. Each number appears just once to form an integer with only one or two digits. What is the number in the square? ○×○=□=○÷○
6. Fill the eight numbers 2-9 in the following formula box to make the formula hold
7. Fill in 1,2,3,4,5,6,7,8,9 in the square so that the formula holds (the number can not be repeated) □ □ □ * □ = □ □ □ □
8. Put the nine numbers 1 to 9 in the following brackets without repetition to make the formula hold () × () × () = () + ()
9. Fill in the brackets with the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 to make the formula tenable and can't be used repeatedly One group: () divide by () = () + () - () = () two groups: () + () - () = () () multiply by () = () () three groups: () () () multiply by () = () ()
10. Add a plus sign or a minus sign between every two adjacent numbers of 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 to form an expression with the result of 37. Then the maximum product of these subtractions (numbers with minus sign added in front) is______ ．
11. In the following, fill in 1, 2, 3, 4, 5, 6, 7, 8 and 9 (the number in each formula cannot be repeated, and the numerator of fraction part is less than denominator), so that the value of formula a with fraction is the largest and that of formula B is the smallest
12. With 4, 5, 6 and 7, which two digit multiplication formula can these four numbers form? What are the minimum product and the maximum product?
13. 2. 3, 4 and 5 constitute the formula of multiplying two digits by two digits, and the product is the largest What are the rules?
14. Use the numbers 0, 2, 5 and 7 to form the formula of multiplying two digits by two digits: 1. How many can you write? 2. What is the largest and smallest product?
15. Choose the numbers 5, 6, 7 and 8 to form the multiplication formula of two digit by two digit to maximize the product Select the numbers 5, 6, 7 and 8 to form the multiplication formula of two digit by two digit, 1. Product maximum () * () = () 2, product minimum: () 8 () = ()
16. Use the four numbers 1.2.3.4 to form a multiplication of two digits by two digits To be the biggest, I'm a primary school student. It's better to list all, with vertical
17. A multiplication formula of two digits multiplied by two digits, one of which is 29. If you add two multipliers and the product, you get 839. What's the other multiplier?
18. Use 2,0,5,6 to form a multiplication formula of two digits multiplied by two digits. Can you write the formula of maximum and minimum product
19. Use 5, 6, 7 and 8 to form the multiplication formula of multiplying two digits by two digits. The formula that maximizes the product is? The formula that minimizes the product is?
20. Use 4, 5, 6 and 7 to form the multiplication formula of multiplying two digits by two digits (the number can't be used repeatedly). Please write the formula of maximum and minimum product?