Fill in the appropriate operation symbol to make the equation hold, 9 () 9 () 9 () 9 = 18 Only add and subtract symbols can be filled in

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• 1. 9 7 5 4 fill in the operation symbol to make the equation hold
• 2. 12 〕 37 〕 5 〕 6 〕 7 = 1998, fill in the appropriate operation symbol in 〕 to make the equation hold! Urgent!
• 3. Fill in the appropriate operation symbol and small extension to make the equation 9 = 7
• 4. 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=______ ．
• 5. 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
• 6. ）5 () 5 () 5 () 5 = 4; 9 () 9 () 9 () 9 () 9 = 18 fill in the operation symbols in brackets 9 () 9 () 9 () 9 = 18,
• 7. Fill them in with the notation 1 9 = 10 in order
• 8. 7 8 9 10 = 24 fill in the operation symbol can not change the position
• 9. 10 69 32 = 48, add bracket and operation symbol
• 10. Fill in appropriate operation symbols between 3, 3, 7 and 7 to make the result equal to 24
• 11. How to add operation symbol for 7 () 9 () 12 () 3 2 = 90
• 12. There are four groups of numbers below. Can you add the operation symbol to make the result all be 24? （1）2 3 4 6 （2）2 5 6 8 （3）1 2 3 10 （4）3 6 7 8
• 13. Fill in some operation symbols in 5 6 7 8 to make the result 24?
• 14. Fill in the operation symbol in 1 3 5 7 to make the result equal to 24
• 15. Add the operation symbol between 4, 4, 10 and 10 to make the result equal to 24
• 16. There are four rational numbers: 3, - 5,2, - 13. How to calculate 24
• 17. Four rational numbers 3,7, - 7, - 3 are operated by 24 points Give the formula
• 18. Calculation of rational numbers 3,7, - 5, - 13.24
• 19. How much is [5 / 6 - {5 / 14-2 / 7] × 7 / 18
• 20. What's 30 times 5 / 18