Subtraction of rational numbers in the first year of junior high school: (1) given that the difference between 3 and a number is - 5, find the number. (2) write two negative numbers so that their difference is - 5, write the formula

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• 1. What are the items in the formula 1 / 2-3 / 2-5 / 2-7 / 4?
• 2. (- 3.8) - (+ 7) who can do the subtraction of rational numbers?
• 3. Find the first day of Mathematics (Centennial Dictionary) rational number subtraction that chapter of the title, in urgent need! Everyone help Only need the question, not the answer!
• 4. (simple calculation that can be simplified) (9) 1011 × (3 / 8 +) (10) 130 △ [(34-25) × 821] (11)205×32-656 (12)(20-1.25×0.8)÷1.9
• 5. 1.41.2×8.1+11×9.25+537×0.19 2.55555×666667+44445×666666-155555 3.0.4 × [11 / 52 △ 2 and 3 / 4 × (4.3-1.8)] × 26 4.（2×4×8×16×32）×（25×6.25×1.25×0.25） 5.85.42×7903.29-286.5×790.329+79032.9×4.323 6.1.135+2.246+3.346+4.475+5.557+6.768+7.768+8.979+9.979 7.1/18+1/54+1/108+1/270+1/378+1/504+1/648+1/810+1/990 8.（1+1）/2+（2-1）/2²+（3-1）/2³+… +The 100th power of (100-1) / 2 9.（1-1/2-1/3-… -1/1999）×（1/2+1/3+1/4+… +1/2000）-[（1-1/2-1/3-… -1/2000）（1/2+1/3+… +1/1999）] 10.20-{[（2²+1）/（2²-1）]+[（3²+1）/（3²-1）]+[（4²+1）/（4²-1）]+… +[（20²+1）/（20²-1）]}
• 6. Mathematics out of form calculation problem (can be simple to calculate) 4.56 + 37 + 4.44 + 47 23 - 8 / 9 × 3 / 8 △ 1 / 27 8.92×7.9+2.1×8.92+28.9 9/10×5/9+4/9×9/10+9/10
• 7. Practical questions (1 15:16:8) The ticket price of the quarter finals of 2002 World Cup announced by the Organizing Committee of South Korea is: 300 US dollars for the first-class seats, 200 US dollars for the second-class seats and 125 US dollars for the third-class seats. During the promotion activities, a shopping mall organized 36 award-winning customers to watch the quarter finals of 2002 World Cup in South Korea. After going out for other expenses, it plans to buy two kinds of tickets with 5025 US dollars (all the money is used up), Please design several schemes for the mall to choose, and explain the reasons
• 8. 11 and 13 Such as the title
• 9. It's from Jiangsu People's education press. Next semester. I'm sick and can't catch up
• 10. Word is not bad, reward points to how much!
• 11. ﹙1/4-5/9-1/3+7/12﹚÷﹙﹣1/36﹚
• 12. Mr. Liu said to Xiaotian, "my age 18 years ago is the same as your age 6 years later. Five years ago, my age was seven times your age. How old is Xiaotian this year?
• 13. Mr. Liu said to Xiaotian, "my age 18 years ago is the same as your age 6 years ago. Five years ago, my age was seven times your age. How old is Xiaotian this year?
• 14. 18.5 * 9 / 7 + 16.5 * 9 / 11-5 help the teacher 18.5 times 7 / 9 plus 16.5 times 11 / 9
• 15. 4/15×6/8= 3/8÷12= 4/5×5/6= 36×5/18= 4/15×6/8= 3/8÷12= 4/5×5/6= 36×5/18= 2/3÷6/5= 6/25×5/18= 7/8×24= 7/12×1/14= 3/7-1/8= 13/25×200= 7/25×51/21= 3-5/18= 5/21×63= 8/19+11/19= 64×5/16=?
• 16. 6 + 9 + 12 + 15 + 18 + for math problems +303 6+9+12+15+18+…… +303
• 17. The mileage of the railway from a to B is 480 km. From a to B, the train a with the word "g" and the train B with the word "d" can go directly to B. It is known that the average speed of train a is 40 km / h faster than that of train B, and the running time is 2 hours less than that of train B_____________ I can't ask the average speed and driving time of car a because I use my mobile phone to ask questions, Three hours or four hours
• 18. A shopping mall in Shenzhen bought a batch of Hainan watermelons before the Spring Festival. They can sell 500 kg a day and make a profit of 0.3 yuan per kg. In order to reduce the inventory as soon as possible, the shopping mall decided to take appropriate price reduction measures. The survey shows that when the sales price is reduced by 0.1 yuan, the sales volume will be increased by 100 kg per day. If the shopping mall wants to make an average profit of 120 yuan per day, how much should the price be reduced per kg of watermelons?
• 19. 1. Cut a 20cm long iron wire into two sections, and make a square with the length of each section of iron wire as the perimeter. To make the sum of the two squares equal to 17cm ^ 2, what are the lengths of the two sections of iron wire? 2. The fruit shop paid 1500 yuan to buy a batch of fruit, which was priced at 50% of the profit. No one bought it, and decided to sell it at a discount, but still no one bought it. As a result, it sold out after another discount. After settlement, the total profit of this batch of fruit was 500 yuan. If the two discounts were the same, how much discount was given each time? (accurate to 0.1 fold)
• 20. A. B is 64 kilometers away from each other. A and B ride bicycles from a and B respectively. B travels 4 kilometers more per hour than A. if a goes 40 minutes ahead of B, the distance they travel when they meet is exactly the same. What are the speeds of a and B?