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How to solve these problems 1/a+3-6/9-a^2 (a/a-b-b/b-a) ·ab/a+b (1/x+1-x+3/x^2-1)/1/x-1 [2/3a-2/a+b(a+b/3a-a-b)]/a-b/a
In the first question, I didn't understand the original formula 2 = (A / A-B + B / a-b) AB / A + B = (a + B / a-b) AB / A + B = AB / a-b3 = (x-1 / X & # 178; - 1 - (x + 3) / X & # 178; - 1 / X-1 = - 4 / x + 14, the original formula = 2 / 3A & # 178; - 2 / A & # 178; + B + B & # 178; / 3A & # 178; - B-B & # 178; / A-B / A
Ask some junior high school calculation questions
1 [the fourth power of X, the second power of y-2x (the second power of x-3xy)] divided by (- the third power of 2x)
2 [(a + b) to the second power + (a-b) to the second power] (2a to the second power - 2b to the second power)
3 (1 / 2) - 1 power + i-3i + (the root of 2-3 is 1.732) - 0 power + (- 1)
4（2x-y-1/2）（2x-y+1/2)
1 [the 4th power of X, the 2nd power of y-2x (the 2nd power of x-3xy)] divided by (- 2x 3rd power) = (x ^ 4y-2x ^ 4 + 6x ^ 3Y ^ 2) divided by (- 2x 3rd power) = - 1 / 2XY + x-3y ^ 2 [(a + B) 2nd power + (a-b) 2nd power] (2a 2nd power - 2b 2nd power) = (A & # 178; + 2Ab + B & # 178; + A & # 178; - 2Ab
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- 6. Urgent! Ask two high acceleration physics application questions! 1. Party A and Party B start to make uniform acceleration linear motion from the agreed place, in which party a always reaches the end point with the same acceleration, while Party B changes to uniform linear motion after the acceleration reaches the general distance, and Party A and Party B just reach the end point at the same time, what is the acceleration ratio of Party A and Party B? 2. The parachute diver can open the parachute only after leaving the plane for a certain distance from 350m altitude. After the parachute is opened, the parachute diver can decelerate uniformly and move vertically with the acceleration of 2m / S ^ 2, and the speed when reaching the ground is 4m / s. The free falling distance of the parachute diver can be calculated To have a problem-solving process, if you can, please attach a little explanation
- 7. Ask a physics calculation problem in grade one of senior high school A car is driving at a speed of 54km / h along a straight road at a constant speed. At a certain moment, the driver sees the red light in front of him and starts to brake. The acceleration when braking is known to be 5 / S2. As a result, the car just stops at the warning line of the red light (1) The total time that a car can move forward after braking (2) The distance from the warning line when the car starts to brake
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- 9. On the calculation of specific heat capacity, those with high attainments in this field come to save me After the iron mass of 100g is heated in the furnace for a long time, it is taken out and immediately put into the cup containing 200g water. The temperature of water rises from 15 ° to 59 ° and the temperature of the furnace is calculated regardless of the heat absorbed by the cup and the heat lost into the air (warm tips: the specific heat capacity of water is 4200j / (kg ° C), the specific heat capacity of iron is 460j (kg ° C). I feel confused. I don't know how to do it. Help me
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- 11. Several junior high school calculation problems -1 / 10 by 11 - 1 / 11 by 12 - 1 / 12 by 13. - 1 / 19 by 20 -1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42
- 12. Basic answering process of junior high school physics calculation questions
- 13. Scientific calculation in junior high school (electric energy) A common table lamp with adjustable brightness (the bulb is marked with the words "220 V, 25 W") adjusts the brightness of the table lamp through a knob type sliding rheostat. If the power of the table lamp changes between 16 W and 25 W in the process of adjusting the sliding rheostat, then: (1) what is the maximum resistance of the sliding rheostat? (2) how many degrees of power consumption does each table lamp normally work for 2 hours in a month (30 days)? PS：..
- 14. When a 1W small bulb lights normally for 1 minute, the power consumption is
- 15. On the physical application of internal energy It is convenient and environment-friendly to use the gas stove. When the general gas stove works normally, it can make 4kg, 23 ℃ water boil in 15 minutes (the boiling point of water in this city is 93 ℃) (1) Heat absorbed by water (2) If the gas stove gives out 65% of the heat Please write down the process of solving the problem, The sixth power of 2936 x10
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- 17. The calculation of physical electric power 1. When the "220 V 40 W" and "220 V 60 W" electric lamps are connected in series in a 220 V circuit, their actual power is calculated 2. With the improvement of people's living standards, refrigerators have entered thousands of households. It is known that the rated power of a household refrigerator is 120W, and the working time of the refrigerator is not continuous. If the total working time of the refrigerator is 6h, how many kilowatt hours of electricity is consumed 3. Resistance R1 = 4 ohm, R2 = 8 ohm in series in the 24 V circuit, at this time, the electrical power of R1? 4. An electric iron needs a certain preheating time before it is used, so people often connect it to the power supply when it is not in use, which not only wastes electricity, but also causes the iron head to be oxidized and not easy to be stained with zinc. Xiao Ming connects an electric iron marked "220 V 55 W" with a bulb (the resistance of the bulb in the preheating state is 495 Ω) to form the circuit diagram as shown in the figure, The soldering iron soon reaches the welding temperature What is the power consumption of electric iron in 1 'preheating state The power consumption of the whole circuit in 2 'preheating state is several percent of that of the electric iron in normal operation ——————Electric soldering iron—— ↑ | 220V ___ Switch__ | ↓ | | | ————- light bulb————
- 18. What's the format of physics calculation questions, What's the format of physics calculation problem? It's better to have an example of arithmetic problem,
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- 20. Calculation on power The rated power of the car is p. = 80kW. The resistance of the car is f = 25000n. The mass of the car is m = 2000kg. If the car starts to move in a straight line with uniform acceleration from standstill, the acceleration is a = 1m / S2. When the car reaches the rated power, it keeps the rated power unchanged and continues to drive 1. The maximum speed that the car can reach in the whole driving process The instantaneous power of the vehicle at the end of 2.20s 3. Instantaneous power when the speed of the car is 5m / s 4. Acceleration when the speed of the car is 20m / s If there is a calculation process (with formula), the result should be correct (I have the result of the answer)