How to solve the addition operation of rational number (- 1 / 2) + 31 / 4 + 2.75 + (- 61 / 2)?

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• 1. Using the operation law of rational number addition to calculate: (1) (- 0.5) + 17 of 4 + (- 19 of 2) + 9.75; (2) 1 and 3 of 4 + (- 6.5) + 3 of 4 3 of 8 + (- 1.75 + 2 and 5 of 8); (3) (- 3.5) + (- 4 of 3) + (+ 7 of 2) + 0.75 + (- 7 of 3)
• 2. (- 1.8) + (+ 0.7) + (- 0.9) + 1.3 + (- 0.2) using the operation law of rational number addition
• 3. 1-x = square of change sign 3 × X - change sign 3 × x
• 4. Help me to work out this math problem For a non-zero natural number, the operation is as follows: if it is even, divide it by two; if it is odd, add 1. The operation does not stop until the number is 1. How many numbers have changed to 1 after 9? Also, I'm in a hurry. I'll be in a hurry in 10 minutes
• 5. Mathematical problems: calculation: 2 √ 2 + 5 √ 2 = (), 3 √ 5 ×√ 5 = ()
• 6. How to calculate cos1.2? Will the exam allow you to use tools?
• 7. Calculation: 2011 times of (- 2) + 2010 times of (- 2) =? Try to explain that three times of 99 - 99 can be divided by 98 Decomposition factor: X & sup2; - 9 =? x²+2x+1=?
• 8. (-1)^6-1^6*(1/2-1/3)\1/3-|-2|.
• 9. Find the law 1,2,2,3,4,6,9, () want to know how to work it out 1,2,2,3,4,6,9,（ ）（ ）（ ） I want to know how to figure it out
• 10. Mathematical recursive equation calculation (with clever calculation) in the fourth grade
• 11. Calculation questions: (- 11 and 2 / 3) △ 13 + 21 and 1 / 2 - (- 10 and 1 / 3) × (- 1 / 13)
• 12. There is a line of numbers: 1,1,2,3,5,8,13,21,34,55. Starting from the third number, each number is the sum of the first two numbers, in the first 10 Practical problem (process): there is a line of numbers: 1,1,2,3,5,8,13,21,34,55. Starting from the third number, each number is the sum of the first two numbers. In the first 100 numbers, how many even numbers are there? If you have a formula, try to give it
• 13. Calculation questions: (1) 5 out of 7 divided by 3-2 out of 21 (2) 14 * 39 out of 14-39 out of 14 divided by 14 (3) 1 and 9 out of 1 divided by [32 and 2 out of 5 - (32.4- 1 / 3 * 0.25)] * 12 on these three questions, thank you very much
• 14. 1/2+1/5=（ ） 12×2/3=（ ） 9/10×5/18=（ ） 3/4-3/5=（ ） 3/7×21=（ ） 12/5×5/4=（ ） 2/13×39
• 15. Mathematics application problem: a highway team built 42 meters on the first day, 30 meters on the second day, 12 / 12 less than the first day. How many meters is the total length of the road?
• 16. Do a batch, the first day to do 11% of this batch of parts, the next day to do 14% of this batch of parts, (1) if the first day is less than the second day 1. In the first day, 11% of the parts were made, and the next day, 14% of the parts were made, (1) If three parts are less made on the first day than on the second day, how many of these parts are there? (2) If 200 pieces are made in two days, how many pieces are there? 2. There are two baskets of apples in a fruit shop. The unit price ratio of big apples to small apples is 5:4, and the weight ratio is 2:3. If the two baskets of apples are just 100 kg, click 4.4 yuan / kg?
• 17. An engineering team built a road, which was 5 / 27 of the total length on the first day and 5 / 27 on the second day An engineering team built a road, which was 5 / 27 of the total length on the first day, 3 / 11 of the remaining length on the second day, 5 / 6 of the remaining length on the second day on the third day, and 8 km on the fourth day?
• 18. (- 2 and 4 / 7) / (- 1 and 5 / 6) / (- 1 and 1 / 21) -1 and 2 / 3 / 4 (- 0.05) × (- 1 and 3 / 4) If it can be simple, it can't be calculated step by step
• 19. (- 8 3 / 7) + (- 7.5) + (- 21 4 / 7) + (+ 3 1 / 2) important process
• 20. The product of five rational numbers is the following 10 numbers: - 12, 0.168, 0.2, 80, - 12.6, - 15, - 6000, 0.21, 84100. Please confirm these five rational numbers and briefly explain the reasons