Add operation symbols or brackets between the following four numbers to make the result equal to 24. Use 9, 3, 7, 2,

（（9+7）/2）*3=（16/2）*3=8*3=24

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1. 11 8, fill in the operation symbol, how can we get 2005?
2. Fill in the middle of 5 = 11 with appropriate operation symbol, which can be in brackets
3. 4 () 4 () 4 = 7 () filled with operation symbols Add another 4 () 4 () 4 = 2
4. 4 () 4 () 4 = 4
5. How to fill in the operation symbol for 4 = 5
6. What are the operation symbols to be filled in when the last four equals nine
7. Fill in the operation symbol between 9 2, and the result is 1000
8. Fill in the number in ×, and the operation symbol in × (□ ×) × 19 = 8 × (25 × 9)
9. (1.992) * (1.992) * (19.922) = 1992 with operation symbol filled in the middle
10. 5 = {1 -- 10} add symbols between them to make the answers get 1,2,3,4,5,6,7,8,9,10! （5＋5）÷5－5÷5＝1 （5＋5）÷5＋5－5＝2 （5＋5）÷5＋5÷5＝3 5＋5－5÷5－5＝4 5×5－5×5＋5＝5 5＋5÷5－5＋5＝6 （5÷5＋5）＋5÷5＝7 （5＋5＋5）÷5＋5＝8 （5×5－5）÷5＋5＝9 （5×5＋5×5）÷5＝10 5 x5 x5 x(5 -5)=0 5 ÷5 +5 x(5 -5)=1 (5+ 5)÷ 5 +5 -5=2 5÷5+( 5+5)÷5=3 (5 +5+ 5+ 5)÷ 5=4 5 x5÷ 5+ 5- 5=5
11. How to add sign equal to 24 for 3, - 5,7, - 13
12. 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
13. Fill in appropriate operation symbols between 3, 3, 7 and 7 to make the result equal to 24
14. 10 69 32 = 48, add bracket and operation symbol
15. 7 8 9 10 = 24 fill in the operation symbol can not change the position
16. Fill them in with the notation 1 9 = 10 in order
17. ）5 () 5 () 5 () 5 = 4; 9 () 9 () 9 () 9 () 9 = 18 fill in the operation symbols in brackets 9 () 9 () 9 () 9 = 18,
18. 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
19. 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=______ ．
20. Fill in the appropriate operation symbol and small extension to make the equation 9 = 7