How to add sign equal to 24 for 3, - 5,7, - 13

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• 1. Add operation symbols or brackets between the following four numbers to make the result equal to 24. Use 9, 3, 7, 2,
• 2. 11 8, fill in the operation symbol, how can we get 2005?
• 3. Fill in the middle of 5 = 11 with appropriate operation symbol, which can be in brackets
• 4. 4 () 4 () 4 = 7 () filled with operation symbols Add another 4 () 4 () 4 = 2
• 5. 4 () 4 () 4 = 4
• 6. How to fill in the operation symbol for 4 = 5
• 7. What are the operation symbols to be filled in when the last four equals nine
• 8. Fill in the operation symbol between 9 2, and the result is 1000
• 9. Fill in the number in ×, and the operation symbol in × (□ ×) × 19 = 8 × (25 × 9)
• 10. (1.992) * (1.992) * (19.922) = 1992 with operation symbol filled in the middle
• 11. 3 3 7 7 fill in the operation symbol, so that the final answer is equal to 24 Can use add, subtract, multiply, divide, bracket, bracket, brace
• 12. Fill in appropriate operation symbols between 3, 3, 7 and 7 to make the result equal to 24
• 13. 10 69 32 = 48, add bracket and operation symbol
• 14. 7 8 9 10 = 24 fill in the operation symbol can not change the position
• 15. Fill them in with the notation 1 9 = 10 in order
• 16. ）5 () 5 () 5 () 5 = 4; 9 () 9 () 9 () 9 () 9 = 18 fill in the operation symbols in brackets 9 () 9 () 9 () 9 = 18,
• 17. Fill in the operation symbols in the brackets to make the mathematical expressions equal. 1 () 2 () 3 () 4 () 5 = 200 If necessary, you can combine several numbers into one number, or add brackets. For example, write (1 + 23) * 4-5 on the left. The two sides of the formula must be equal
• 18. It is known that a mathematical symbol △ holds the following equation: 2 △ 4 = 8, 5 △ 3 = 13, 3 △ 5 = 11, 9 △ 7 = 25, then 7 △ 3=______ ．
• 19. Fill in the appropriate operation symbol and small extension to make the equation 9 = 7
• 20. 12 〕 37 〕 5 〕 6 〕 7 = 1998, fill in the appropriate operation symbol in 〕 to make the equation hold! Urgent!