1 / 2 + 3 / 4 + 7 / 8 + 15 / 16 + 31 / 32 + 63 / 64 Urgent need

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• 1. A project is planned to be completed in 10 days, and the actual task is completed in 8 days. The working time is shortened by 20%, and the work efficiency is improved by 25%! Why? Working time reduced: (10-8) △ 10 = 20% Work efficiency: originally completed in 10 days, 1 / 10 of every day, The actual completion time is 8 days, 1 / 8 of every day Improved: (1 / 8-1 / 10) △ 1 / 10 = 1 / 4 That is to say, the work efficiency is 25% higher than the plan! (1 / 8-1 / 10) why divide by 1 / 10?
• 2. One job, originally planned to be completed in 10 days, was actually completed in 8 days, and the working time was shortened______ %, work efficiency improved______ %．A.12.5   B.20   C.25   D.10．
• 3. The time for a project to be completed is shortened from the original 30 days to 20 days. How many points has the work efficiency been improved?
• 4. A task was originally planned to be completed in ten days, but it was actually completed in eight days. The work time was shortened by several percent, and the work efficiency was improved by several percent What is the efficiency 10/8-1=25% Is that right What is the idea of this formula
• 5. One job, originally planned to be completed in 10 days, was actually completed in 8 days, and the working time was shortened______ %, work efficiency improved______ %．A.12.5   B.20   C.25   D.10．
• 6. A job, originally planned to be completed in 10 days, was actually completed in 8 days. How much has the working time been shortened and how much has the work efficiency been improved?
• 7. The washing machine factory plans to produce 1200 washing machines in 25 days. In fact, it completed the task five days ahead of schedule, and actually completed several percent of the task every day Expressed by the simplest fraction
• 8. One job, originally planned to be completed in 10 days, was actually completed in 8 days, and the working time was shortened______ %, work efficiency improved______ %．A.12.5   B.20   C.25   D.10．
• 9. One job, originally planned to be completed in 10 days, was actually completed in 8 days, and the working time was shortened______ %, work efficiency improved______ %．A.12.5   B.20   C.25   D.10．
• 10. One job, originally planned to be completed in 10 days, was actually completed in 8 days, and the working time was shortened______ %, work efficiency improved______ %．A.12.5   B.20   C.25   D.10．
• 11. 3 / 4 × a few parts = 1.7 × a few parts = 1.9 × a few parts = 1 The edge length of a cube is 3 / 10 meters. Find the surface area and volume of the cube There are 3 / 4 tons of coal in the canteen, and there are 2 / 5 after using part of it. How many tons are left? There are 3 / 4 tons of coal in the canteen. 2 / 5 tons are used. How many tons are left?
• 12. 9 / 7 = fractions = 1 and fractions
• 13. Divide the 18 apples into 6 portions on average, one portion is a fraction of the total number, five portions are a fraction of the total number, and how many are there?
• 14. What's the percentage of 5 / 6 of 18 kg? What's the percentage of 4 / 5 of 2 / 3 kg
• 15. 3000 (1 + x) 50% (1 + 2 / x)
• 16. Complement and inverse of the original code Write the original code, complement code and inverse code of - 06875 and 11 respectively It is represented by 8 digits
• 17. 2X plus 1.5x = 17.5, please use the fifth unit equation to solve!
• 18. There is a three digit number. The number on the tenth digit is 23 times that on the tenth digit. The number on the tenth digit is 2 times more than that on the tenth digit. The number on the tenth digit is 2 times that on the hundred digit______ ．
• 19. When the value of the independent variable x satisfies what conditions, the value of the function y = 5x + 17 satisfies the following conditions (please write in the image method) （1）y=0 （2）y=-7 （3）y=20 Note: it should be represented by image method
• 20. Factorization of 2x ^ 2-4xy + 2Y ^ 2-3 (X-Y + 3)