Add the operation symbol between 4, 4, 10 and 10 to make the result equal to 24

Method 1: (10 × 10 - 4) △ 4 method 2: 10 + 10 + ^ 4 + ^ 4 Description: ^ 4 means "root 4", which is equal to 2

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1. Fill in the operation symbol in 1 3 5 7 to make the result equal to 24
2. Fill in some operation symbols in 5 6 7 8 to make the result 24?
3. 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
4. How to add operation symbol for 7 () 9 () 12 () 3 2 = 90
5. 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
6. 9 7 5 4 fill in the operation symbol to make the equation hold
7. 12 〕 37 〕 5 〕 6 〕 7 = 1998, fill in the appropriate operation symbol in 〕 to make the equation hold! Urgent!
8. Fill in the appropriate operation symbol and small extension to make the equation 9 = 7
9. 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=______ ．
10. 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
11. There are four rational numbers: 3, - 5,2, - 13. How to calculate 24
12. Four rational numbers 3,7, - 7, - 3 are operated by 24 points Give the formula
13. Calculation of rational numbers 3,7, - 5, - 13.24
14. How much is [5 / 6 - {5 / 14-2 / 7] × 7 / 18
15. What's 30 times 5 / 18
16. What's six out of thirty equal to five out of ten divided by 20 equal to 18 out of ten
17. 12 out of 25 = how much: 50 = 18:1 how much = how much%
18. 25 points 12 equals (): 50 = 18: () = ()%
19. What is 1 in 18 to the power of 0 What is the 0 power of (- 100)
20. How much is five thirds plus one ninth?