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? ○×○=□=○÷○

It is obvious that the number in the box and the divisor are two digits, and the multiplier and divisor are one digit. It can be seen that 0 is not suitable to be a multiplier, let alone a divisor

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