Please give a detailed answer to the fifth grade math, thank you! (7 9:18:35) Xiao Wei writes 45 Chinese characters in a week, and Xiao Li 183 Chinese characters in a month

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• 1. 5/(7/9)/(9/11)/(11/21)=
• 2. Simple mathematical calculation 1 / 2 * 3 + 1 / 3 * 4 + 1 / 4 * 5 +... 1 / 99 * 100
• 3. The problem of mathematical simple calculation 1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
• 4. What can be calculated simply must be calculated simply, and what cannot be calculated simply can not be calculated simply 1.5/7÷5/12×（7/12-5/12）+5/7 2.3 / 16 × 1 and 7 / 9 + 1 / 2 × 7 / 13 + 6 / 13 × 0.5 3.（4/5-1/3）÷（7/8+7/10×5/12） 4.4/9÷〖4/5-（1/5+1/3）〗 5.2 and 2 / 3 × 4 / 5 + 0.8 × 1 and 1 / 3 + 6 × 80 ‰ 6.15/16+(7/16-1/4)÷1/2 7.1/3÷（2/3-2/5）×3/5 8.8/9+8/9+8/9+8/9+5/9 9.〖1/2-（3/4-3/5）〗÷7/10 10.（3/5-2/5×3/4）÷1/5+0.5 100 points for satisfaction Make it clear
• 5. Mathematical problem off form calculation 4-[3.75×（1.2-1/3）+3/4]
• 6. Simple mathematical calculation 50 questions, one formula includes multiplication, division, addition or subtraction, Speed up! Six years·
• 7. 276÷{32-[306÷（201×47-9413）]}=______ ．
• 8. How to simplify these questions? 1.99.9X7+11.1X37 2.4.2X4.2+0.42X58 3.1.25X(8+0.8+0.8)
• 9. Help me with a few simple problems 1.25×0.79×16 15.7-12.6×0.3 0.571×0.1-0.57×0.1 4.6×0.75+0.46×2.5 48×0.25
• 10. How can this problem be simplified 197×97/98+1/98 How can we make a simple calculation,
• 11. A brief calculation of 50 mathematics problems in grade five of primary school
• 12. 1 2 3 —— + —— - —— = 0 x-1 x+2 x-3
• 13. It is known that the x power of 25 is 2000 Y power of 80 = 2000 Find the value of: 1 / x + 1 / Y
• 14. Given ABC ≠ 0, a + B + C = 0, find the value of a × (1 of B + 1 of C) + B × (1 of C + 1 of a) + C × (1 of a + 1 of B)
• 15. A = (7 / 3) to 1004, B = 3 to 2008, C = 15 to 2008 D = 7 to the power of 2008, e = 35 to the power of 2008 f=（b+c）/（d+e） g=√f Calculation: a * g (in fact, the original problem is direct calculation. There is no abcdefd. The main problem is that the numbers and symbols are not easy to input with the keyboard and you can understand them.)
• 16. Complete square formula and square difference formula 1、 Given: a + B = 10, ab = 20, find the value of the following test: (1) a ^ 2 + B ^ 2 (2) (a-b) ^ 2 2、 If x ^ 2 + MXY + 4Y ^ 2 is a complete square test, find the value of M. 3、 Calculate 2004 ^ 2 - 2003 ^ 2 + 2002 ^ 2 - 2001 ^ 2 + +4^2 - 3^2 + 2^2 - 1 = Thank you very much
• 17. Xiao Zhang is walking at a constant speed on the ring road. Every four minutes, a bus meets him head-on. Every 12 minutes, a bus of the same route runs from his back to his front. How many minutes does the bus stop send a bus?
• 18. Junior high school fraction problem. Prawn save There are four questions altogether (1) Given that a + 1 / b = B + 1 / C = C + 1 / A, and a ≠ B ≠ C, can you find the square of a multiplied by the square of B multiplied by the square of C? Please give the reason (2) A ship goes back and forth between port a and port B. from port a to port B, it goes along the water, and from port B to port a, it goes against the current. It is known that the speed of the ship in still water is 8km / h, and the time ratio of sailing against the current is 2:1. One day, it happens to be a rainstorm, and the speed of the current is twice that of the original. This ship goes back and forth for 9h. How far is the distance between port a and port B? (3) In order to speed up the western development, an Autonomous Region decided to build a new highway, which was contracted by Party A and Party B. If Party A works alone, it will be completed on schedule; if Party B works alone, it will take six months to complete. Now Party A and Party B work together for four months, and the rest will be constructed by Party B alone, How long does it take to build this road? (4) The buyer of a shopping mall predicted that a commodity would sell well in the market, so he used 80000 yuan to buy the commodity. After the commodity was put on the market, it was in short supply. The shopping mall used 176000 yuan to buy the second batch of this commodity, which was twice as much as the first batch. However, the unit price of the purchase was 4 yuan more expensive. When the shopping mall sold the commodity, the price was 58 yuan for each piece. Finally, the remaining 150 pieces were sold at a 20% discount and sold out quickly, How much is the total profit of the mall? So many topics Because I know my score is not very much Just ask the prawns to do as much as they can Because it's urgent
• 19. On the application of fractional equation In order to maintain the balance between food production and natural ecology, China began to implement the policy of "returning farmland to forest" in 2000. In small villages, the original cultivated land is 600 hectares and the forest land is 150 hectares. It is planned to turn part of the cultivated land into forest land, so that the forest land area accounts for 80% of the cultivated land area?
• 20. Application of fractional equation There are two roads from Beibei's home price to the school, each of which is 3km. The first road is a flat road, the second road has an uphill road of 1km, and the second road has a downhill road of 2km. Beibei's riding speed on the uphill road is vkm / h, on the flat road is 2vkm / h, and on the downhill road is 3vm / h 1. When taking the second road, what is the speed from home to school? 2. Please help him figure out which way to take and how long to take?