In order to solve 20 mixed operations of rational numbers,

2+6{5+1}=?

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1. Simple puzzle of mixed operation of rational numbers in junior high school mathematics problems 1-1-2.45x8+2.55x（-8） Why can't this formula be simplified, only 1-1-19.6-20.4
2. Mixed operation of rational numbers, 1. (simple method) - 99 and 18 / 17 * (- 9) 2、-1²-【10/7+（-12）/6】²*（-3/4）³
3. Please write a rational number mixed operation problem and write the calculation process. The problem should meet the following conditions at the same time: 1. It must contain five operations: addition, subtraction, multiplication, division and power 2. Divisor must be a fraction 3. The base of a power operation must be a negative fraction 4. The result is equal to 2010
4. Mixed operation of rational numbers, The interest tax of a certain one-year fixed deposit with an interest rate of 20% (for example: deposit 100 yuan for one-year period, and the calculation formula of the income interest of the due depositor after tax is 100 * 2.25% - 100 * 2.25% * 20%). If a depositor has a one-year fixed deposit with an interest rate of 450 yuan after tax, how much is the deposit?
5. （1998/1-1）（1997/1-1）（1996/1-1）...（1001/1-1）（1000/1-1） Wrong, the numerator is 1, the denominator is 1998, everything else is
6. Application questions, quick The total weight of two baskets of vegetables is 84 kg. Take 20% of them out of basket a and put them into basket B. take 2 kg out of basket B and put them into basket a. the weight of the two baskets is exactly the same. How many kg are the total weight of the two baskets?
7. For a batch of parts, it takes 8 hours for Party A to produce them alone. Now, after Party A has done it for 2 hours, Party B has joined in the work, and it takes 4 hours for them to complete the task. It takes Party B to produce these parts alone___ Hours
8. The basic quantitative relationship of practical questions of fractions There are three one two three
9. Practical problems of grade 6 1. The fruit shop wholesales a batch of oranges and pears at a total price of 1700 yuan. When the oranges are sold at 26% profit and the pears are sold at 11% profit, the total price is 2007 yuan. How much is the purchase price of these oranges? 2. The department store sells a batch of clothes at 60 yuan per piece. When five eighths of the clothes are sold, the department store will make a profit of 200 yuan after recovering all the costs. When the rest of the clothes are sold, it will make a profit of 1800 yuan. What is the cost of this batch of clothes? 3. At present, the concentration of 10% brine is 20 kg. How many kg of 30% brine can be added to obtain 22% brine? 4. For a TV set, the market will add 35% to the purchase price, and then sell it at a 10% discount. The price of each TV set is 50 yuan, so that each TV set can make a profit of 208 yuan. How much is the purchase price of this TV set?
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11. A difficult problem about the power of mathematics in grade one of junior high school It is known that the 55th power of 2 = a, the 33rd power of 3 = B, and the 22nd power of 5 = C Compare the size of a, B, C
12. A power calculation problem! Can you confirm the last number of 3 to the power of 2008? Please give your reasons and calculate the following questions 1. (- 0.125 to the power of 2007) * (- 8 to the power of 2008) 2. (- 2 to the power of 2001) + (- 2 to the power of 2000) 3. Two thirds to the fifth power * (- three thirds to the fifth power) 4. The opposite number of four fifths power of 2008 * (- five fifths power of 2008)
13. Application of power The thickness of a piece of paper is 0.09mm. Xiaoming's height is 1.6m. Fold the paper continuously (the creases are parallel). How many times do you fold the paper to make it thicker than Xiaoming's height
14. A problem of power calculation The square of 2 + 2 + 2 + the cube of 2 + the fourth power of 2 +. + the power of 2006 =?
15. Calculation of power (- 2) Λ 2005 + 2 Λ 2004 (- what is the power of 2005 of 2 plus the power of 2004 of 2)
16. The given line AB 2cm extends AB to C, making AB to C, making BC = 2 / 1 × AB, and then extends AC to D in reverse, making ad = 2 / 1 × AC 【1】 Draw this picture 【2】 Finding the length of line segment ad
17. The latest edition of 2012 textbook, seventh grade volume I mathematics evaluation manual, Chapter II rational number section and thinking, p38 [content and method], the first question of knowledge and structure box filling, the first session P40 [inquiry and thinking] the sixth question of operation calculation and research, the second session p42 inquiry and thinking, the sixth question of binary
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19. If the purchase price of a commodity is 3000 and the price is 4500, how much discount can the store sell at a discount of no less than 5% of the profit? If the sales of the commodity is not good, the store will sell it at a discount of no more than 5% of the profit. How much discount can the store sell it at a discount of no more than 5% of the profit?
20. How to solve the second problem on page 190 of the seventh grade mathematics volume I of Beijing Normal University Edition