Five nines with appropriate symbols are 73

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• 1. According to the requirement of operation result, add operation symbol and bracket 1 / 20.43/101/50.1 = 100.30.30.30.30.30.3 = 0 0.3 0.3 0.3 0.3 0.3=1 0.3 0.3 0.3 0.3 0.3=2 0.3 0.3 0.3 0.3 0.3=4
• 2. 1 what, 2 what, 3 what, 4 what, 5 what = 10 with appropriate operation symbols and brackets
• 3. 1, 2, 3, 4, 5 = 4 can be added with operation symbols in brackets
• 4. Do you want to change symbols when moving items? Like 3x-7 + 7 = 3-2x-6, I'm bad at math. I don't know anything about symbols
• 5. What is the law of the sign change of mathematics without bracket in the first volume of junior high school
• 6. When does a linear equation of one variable change sign When does the equation of one variable change sign, for example, why does (20-x) in 4x-3 (20-x) = 3 change sign
• 7. Sign problem of inequality for linear equation of one variable Don't tell me to multiply or divide on both sides 2X-1〈4X+13 2X-4X〈13+1 -2X〈14 How to see X-7? Teach me. I just don't understand the sign. I can do the equation
• 8. Mathematical equation of one variable, for example, 5Y = 50 + 4Y, when the solution contains unknowns on the left, how does its sign change when it moves over People's education press grade 7 Volume 1 mathematics Chapter 5 equation of one dollar, because I have to do homework
• 9. Steps of rational addition and subtraction?
• 10. The general steps of the mixed operation of addition and subtraction of rational numbers are: (1)________ ;(2)_________ ;(3)________ _______ ;(4)__________________
• 11. 5 what 5 what 5 what 5 what 5 equals 9
• 12. What symbol in the middle of 9 7 5 4 is equal to 24 9 7 5 4 is equal to 24
• 13. 1/2,1/3,1/4,1/5,…… 1 / 90, 1 / 91, pick out ten numbers, add the sign, and their sum is - 1
• 14. 1 / 2, 1 / 3, 1 / 4, 1 / 5... 1 / 90, 1 / 91, choose 10 numbers from them, add a sign to make the sum equal to - 1
• 15. 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?
• 16. There are 90 Egyptian numbers, there are 90 Egyptian numbers, 1 / 2, 1 / 3, 1 / 4,..., 1 / 90, 1 / 91. Choose ten of them and add the sign to make them equal to - 1
• 17. 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
• 18. 2/1,3/1,4/1,5/1,… 90 / 1, 91 / 1, you can pick out 10 of them and add a sign to make their sum equal to - 1
• 19. There are 90 scores: 1 / 2, 1 / 3, 1 / 4, 1 / 5 1 / 90, 1 / 91, can you pick out 10 of them and add a sign to make their sum equal to - 1? There are 90 scores: 1 / 2, 1 / 3, 1 / 4, 1 / 5 1 / 90, 1 / 91, can you pick out 10 of them and add a sign to make their sum equal to - 1? Write down 10 numbers
• 20. 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?