How to make 2,7,8,11 into a formula by using operation symbols and adding brackets to make the result equal to 24?

（8-2）*（11-7）=24

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1. 1. Add operation symbol to make 3 = 24 The order cannot be reversed
2. 5 = {1 -- 10} add symbols between them to make the answers get 1,2,3,4,5,6,7,8,9,10! Move your head!
3. 8 4 3 = 24 add sign and bracket to form formula
4. Please add appropriate operation symbols to make the operation result 24. - 4,3,8,1
5. Finding the general formula of 1,2,3,5,7,10,13,17,21 Find 1,3,5,10,16,24,37,53 Find 1,3,6,10,17,26,41,61 General term formula
6. 1,2,5,10,17 I know the answer!
7. 2 / 3, - 1,10 / 7, - 17 / 9,26 / 11?
8. What are the general formulas of 1,2,5,10,17,26 and 1,3,7,13,21?
9. What is the general formula of 1,3,7,13,21 What is the general formula of 1,3,7,13,21,31
10. 3,7,13,21,31
11. How to calculate 24 o'clock from 3, 7, 1 and 8? I solved (7-3-1) * 8
12. What symbol does 9999 use to calculate 24 points
13. Fill in the appropriate operation symbols and brackets on the horizontal line to calculate "24 points" - 4_____ 6 _____ （-3) _____ 2=24
14. 24 points: [the given four numbers, the use of "+. -. X. /" and multiplication square operation symbols and brackets, you can disorder the order, the calculated number is equal to 24] 《 4 5 7 9 》《 3 7 8 8 》《 2 2 8 8 》《 3 3 7 7 》《 1 3 5 7 》《2 3 6 9》
15. 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
16. (1.992) * (1.992) * (19.922) = 1992 with operation symbol filled in the middle
17. Fill in the number in ×, and the operation symbol in × (□ ×) × 19 = 8 × (25 × 9)
18. Fill in the operation symbol between 9 2, and the result is 1000
19. What are the operation symbols to be filled in when the last four equals nine
20. How to fill in the operation symbol for 4 = 5