The following formula is composed of the numbers 1-9, and fill in the appropriate number. 9. () - (). 4 () = (). () 1

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• 1. The 10 numbers of 0-9 are filled in 10 & #; to form the following three formulas. (each number can only be used once.) 〾+〾=〾 〾-〾=〾 〾X〾=〾
• 2. Fill in the following blanks without repetition of the nine numbers 1 to 9 to make the formula true （ ）x( )x（ ）=（ ）+（ ） } () divide () = () divide ()
• 3. Put the nine numbers 1 to 9 in the following space to make the formula true ()×()()=()()()=()()×()
• 4. Fill 0 to 9 in the following space respectively to make the formula hold. Each number can only be used once □ + □ = □ + □ = □ + □
• 5. The nine numbers 1-9 shall be filled in the blanks of the following formula respectively, and only one number is allowed to be filled in each blank to make the formula tenable: □
• 6. Fill the seven numbers of 0,1,2,3,7,8,9 in the box to make the formula true □+□=□□-□=□□
• 7. Put the 8 numbers 0-7 into the formula. 0, () () + 0, () + 0, () () + 0, () = 1, 00 fast
• 8. 1 2 3 = 1 1 2 3 4 5 6 = 1 1 2 3 4 5 6 7 = 1 add, subtract, multiply, divide, brackets make the formula equal to 1
• 9. 7 5 3 4 equals 24 And 5 2 3 6 equals 24.8 9 3 1 equals 24
• 10. Fill the nine numbers - 8, - 6, - 4, - 2, 0, 2, 4, 6 and 8 into the nine squares in the graph, so that the sum of three numbers in each row, three numbers in each column and three numbers in diagonal angle is 0
• 11. Fill in nine numbers from 1 to 9 in (each number is filled in only once) to form three correct formulas
• 12. 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______ ．
• 13. 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 () = () ()
• 14. Put the nine numbers 1 to 9 in the following brackets without repetition to make the formula hold () × () × () = () + ()
• 15. 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) □ □ □ * □ = □ □ □ □
• 16. Fill the eight numbers 2-9 in the following formula box to make the formula hold
• 17. 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? ○×○=□=○÷○
• 18. 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? ○×○=□=○÷○
• 19. 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? ○×○=□=○÷○
• 20. 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? ○×○=□=○÷○