(- 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

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• 1. 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?
• 2. 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?
• 3. 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?
• 4. 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
• 5. 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
• 6. 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
• 7. Calculation questions: (- 11 and 2 / 3) △ 13 + 21 and 1 / 2 - (- 10 and 1 / 3) × (- 1 / 13)
• 8. How to solve the addition operation of rational number (- 1 / 2) + 31 / 4 + 2.75 + (- 61 / 2)?
• 9. 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)
• 10. (- 1.8) + (+ 0.7) + (- 0.9) + 1.3 + (- 0.2) using the operation law of rational number addition
• 11. (- 8 3 / 7) + (- 7.5) + (- 21 4 / 7) + (+ 3 1 / 2) important process
• 12. 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
• 13. 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
• 14. 1.168÷4=?2.155÷5=?3·246÷6=?4.488÷2=?5.630÷7=?6.213÷3=?
• 15. Please answer the math application questions of grade 2 in detail, thank you! (6 21:14:30) Yang Hui, a mathematician in the Southern Song Dynasty, once put forward such a question: "the area of Zhitian (rectangle) is 864 (square steps), only the width (width) of cloud is less than 12 steps (width is 12 steps less than length). How many steps are the length of the problem and its specific solving process
• 16. Practical questions (6 21:14:26) Yang Hui, a mathematician in the Southern Song Dynasty, once put forward such a question: "the area of Zhitian (rectangle) is 864 (square steps), only the width (width) of cloud is less than 12 steps (width is 12 steps less than length). How many steps are the length of the problem and its specific solving process
• 17. Please answer the math problem of grade 6 in detail, thank you! (22:18:20:37) A batch of parts, first processing 160, and then processing the remaining two fifths, at this time, the number of processed parts and the remaining parts are equal, how many parts are there in this batch of parts
• 18. There is a two digit number, the sum of the number on the ten and the number on the one is 8. If you transpose the number on the ten and the number on the one, the two digits obtained will be multiplied by the original two digits, and 1855 will be obtained
• 19. There is a two digit number. If you transpose its digits A and ten digit number B, under what circumstances will you get two digits larger than the original two digits? There is a two digit number. If you transpose its digits A and ten digit number B, under what circumstances will you get two digits larger than the original two digits? Under what circumstances will you get two digits smaller than the original two digits? Under what circumstances will you get two digits equal to the original two digits?
• 20. Definition: if there are two two digits, and the number of ten and ten of any one digit is the number of ten and ten of another digit respectively, then such two digits are called "mutually friendly two digits" (1) Try to explain the reason why the difference between two digits must be a multiple of 9; (2) Based on the above experience, what conclusions can you draw?