A group of parts processed by four persons of a, B, C and D A processes frac12;, B processes 3 / 1 of the rest, C processes 5 / 3 of the rest, and D processes 200 pieces. How many parts are there in total? Please be clear

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• 1. A plane flies 240 meters per minute, B flies 15 minutes, C flies 3600 meters in total
• 2. (b-c)(b+c-a)+(c-a)(c+a-b)+(a-b)(a+b-c) It is related to factorization
• 3. Calculation questions a, B, C a+bc^2=30, a+bc^3=50, a+bc^4=90 Find a, B, C How to get it?
• 4. A-b-a-b
• 5. How to get the result of a: B from (B-A): a = a; b
• 6. A practical problem of grade one in junior high school with a and B In 2007, a farmer contracted several mu of barren hills and invested 7800 yuan to plant 2000 fruit trees. This year, the total output of fruit is 18000 kg. The fruit is sold at a yuan per kilogram in the market and B yuan per kilogram in the orchard (B is less than a). The farmer brought the fruit to the market and sold 1000 kg per day on average, with the help of 8 people. Each person paid 25 yuan per day, and the agricultural vehicle freight and other taxes were 100 yuan per day (1) A and B represent the income from selling fruits in two ways respectively? (2) If a = 1.3 yuan, B = 1.1 yuan, and the two ways of selling fruits sell out all the fruits in the same time, please explain which way is better by calculation (3) The farmer strengthens the management of the orchard and strives to achieve a net income of 15000 yuan by next year. The farmer adopts the better selling method in (2). What is the growth rate of net income? (net income = total income total expenditure)
• 7. Junior high school science requires writing formulas, In order to reduce urban air pollution, Shenzhen municipal government encourages citizens to use electric bicycles. The technical parameters of an electric bicycle are as follows: 1. Motor 36V, 180W 2. Sealed maintenance free lead acid battery (12V, 12a) x3 3. The rated load is 75kg and the maximum speed is 20km / h 4. It can drive 60km at normal speed of 15km / h 5. Charging power consumption is 1.2kw/h when driving 100km (1) How much work does an electric bicycle do to overcome the resistance when it runs at a normal speed (15km / h) with a resistance of 24N? (2) What is the mechanical efficiency of the electric bicycle?
• 8. The formula of applied problems in junior algebra For junior high school algebra application problem calculation formula, such as growth rate, interest rate, profit, work problems, travel problems, profit and loss problems Don't worry about geometric theorems
• 9. What formulas are applied to junior high school practical problems?
• 10. Make up three practical problems according to 2X-4 = 30
• 11. Number a is five percent more than number B, and number B is five percent less than number a? This is a smart question, I think for a long time will not, hope brothers and sisters help
• 12. 3 / 4 of the number a = 3 / 5 of the number B. if the number a is 20 less than the number B, what is the number a
• 13. The ratio of three numbers of a, B and C is 2:4:5. A is 12.6 less than B, so what is the average number of a and C
• 14. In Yuxin primary school, 108 people participated in the school's science and technology group, of which the number of boys was 1.4 times that of girls?
• 15. In a workshop, the number of male workers is 40% more than that of female workers, and how much less is the number of female workers than that of male workers? Who can tell me, thank you.
• 16. There are 480 male and female employees, and male employees account for 3 / 5 of the total number. If male employees are transferred, and male employees account for 9 / 20 of the total number, how many are transferred?
• 17. A cement plant plans to produce a batch of cement in January. In fact, it has completed one third of the plan in the first ten days, two fifths of the plan in the middle ten days, and another 260000 tons in the last ten days. As a result, it has exceeded one sixth of the plan. How many tons of cement does the cement plant plan to produce in January? There are several solutions? Please list them There are several solutions? Please list them all
• 18. There are 180 tons of coal on the wharf, which was originally planned to be transported by 15 trucks, but actually reduced to 9 trucks. Now how many tons more are transported by each truck than originally planned?
• 19. 13: The railway from a to B is about 360 kilometers long at 16:30. How many kilometers per hour does the train travel? How many hours does it take for the children
• 20. The fast train and the slow train leave each other from a and B. the fast train takes one fifth of the whole journey first, and then the slow train leaves 11 kilometers later. When they meet, the slow train makes the whole scene Two out of seven are known to have a speed ratio of 5 to 4