What symbol in the middle of 9 7 5 4 is equal to 24 9 7 5 4 is equal to 24
4×9-7-5=24
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- 13. Calculation: now there are 90 Egyptians, 1 / 2, 1 / 3 1 / 91, select 10 of them, add the sign to make the sum of them equal to - 1?
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- 15. 90 Egyptians: 1 / 2, 1 / 3, 1 / 4, 1 / 5 , 1 / 90, 1 / 91, select 10, add positive and negative signs, so that the sum of them is - 1
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- 18. Egypt, like China, is one of the four ancient civilizations. Ancient Egyptians only used scores with numerator 1, such as 1 / 3 + 1 / to represent 2 / 5, 1 / 4 + 1 / 7 + 1 / 28 to represent 3 / 7, and so on. Now there are 90 Egyptian scores: 1 / 2, 1 / 3, 1 / 4, 1 / 5,... 1 / 90, 1 / 91. Can you pick out 10 of them, plus the sign, is their sum equal to - 1?
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- 20. 123456789 is equal to 24 by addition and subtraction