Fill the eight numbers 2-9 in the following formula box to make the formula hold

（4+7+8+9）÷（3+5+6）=2

RELATED INFORMATIONS

1. 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) □ □ □ * □ = □ □ □ □
2. Put the nine numbers 1 to 9 in the following brackets without repetition to make the formula hold () × () × () = () + ()
3. 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 () = () ()
4. 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______ ．
5. Fill in nine numbers from 1 to 9 in (each number is filled in only once) to form three correct formulas
6. The following formula is composed of the numbers 1-9, and fill in the appropriate number. 9. () - (). 4 () = (). () 1
7. The 10 numbers of 0-9 are filled in 10 & #; to form the following three formulas. (each number can only be used once.) 〾+〾=〾〾-〾=〾〾X〾=〾
8. Fill in the following blanks without repetition of the nine numbers 1 to 9 to make the formula true （）x( )x（）=（）+（） } () divide () = () divide ()
9. Put the nine numbers 1 to 9 in the following space to make the formula true ()×()()=()()()=()()×()
10. Fill 0 to 9 in the following space respectively to make the formula hold. Each number can only be used once □ + □ = □ + □ = □ + □
11. 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? ○×○=□=○÷○
12. 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? ○×○=□=○÷○
13. 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? ○×○=□=○÷○
14. 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? ○×○=□=○÷○
15. 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? ○×○=□=○÷○
16. 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
17. 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
18. 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?
19. 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?
20. 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?