Photos of Daniel in Ethereum
Publish: 2021-05-25 17:47:17
1. Repair method:
1. First, connect the computer, at least have a "removable disk" (SD card) in "my computer"
2, turn on the start run CMD of the computer
3, run "CHKDSK / F G: (underlined & quot; G" It's the letter of your removable disk (SD card). If it's not a G disk in the computer, change the letter to the letter of your removable disk (SD card)
4, click enter to start the repair
5. After repairing, right-click SD card properties - tools - start checking - mark "√" for "automatically repairing file system errors" and "scanning and trying to recover bad sectors" (this step is very important, because when this item is not used at the beginning, the memory card is pulled out after repairing, and it is still bad when it is inserted).
1. First, connect the computer, at least have a "removable disk" (SD card) in "my computer"
2, turn on the start run CMD of the computer
3, run "CHKDSK / F G: (underlined & quot; G" It's the letter of your removable disk (SD card). If it's not a G disk in the computer, change the letter to the letter of your removable disk (SD card)
4, click enter to start the repair
5. After repairing, right-click SD card properties - tools - start checking - mark "√" for "automatically repairing file system errors" and "scanning and trying to recover bad sectors" (this step is very important, because when this item is not used at the beginning, the memory card is pulled out after repairing, and it is still bad when it is inserted).
2. Replace memory card
3.
"Elastic computing"; It means that users can flexibly and actively purchase computing resources according to the actual business or computing needs. To achieve on-demand use, on-demand payment and on-demand delivery
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computing resources include cloud server, load balancing and cloud database. Cloud server integrates high-performance servers and high-quality network resources. Cloud OS uniformly manages cluster resources. Each cluster can be virtualized with multiple independent servers, and can migrate freely in the cluster, which greatly improves the stability of cloud server
-
high stability is the foundation of relational database services. Large scale platform commercial relational database services provide data services with high availability, high read-write function and high security. Load balancing is to set virtual server IP, make the resources of back-end authenticity server into a high-performance server, and distribute a large number of application requests from clients to back-end server for processing through algorithm
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the combination of the three kinds of elastic resources can provide users with strong elastic computing capacity to adapt to the changing business needs< br />
4. Use the memory card repair tool to repair it, but only if the computer recognizes the card. Otherwise, the card, after formatting, do not write data to it, use the disk data recovery tool to recover the files you want in the card, generally not too large files can be recovered, remember, can only be recovered once! I've recovered my phone's memory card twice before.
5. 1.e=-(dq/dp)*(p/q),p=20:e=-(-1)*(20/70)=2/7,p=40:e=-(-1)(40/50)=4/5;
2. Simultaneous supply and demand equation: q = 10, P = 4 / 3; Demand elasticity ed = - DQ / DP * P / Q = 3 * (4 / 3 / 10) = 2 / 5, supply elasticity ES = DQ / DP * P / Q = 6 * (4 / 3 / 10) = 4 / 5
3. (1) e = - DQ / DP * P / Q = 2 * [P / (10-2p)] = 1 / [(5 / P) - 1]
(2) let e = 1, then p = 5 / 2, when 0 & lt; p< 5 / 2, 0 & lt; e< Firstly, if there is no elasticity, the price should be raised to increase the total income; When P & gt; 5 / 2, E & gt; If it is flexible, it should rece the price and increase the income; When p = 5 / 2, the total income is the largest< br />(3)p=2：q=6 CS=3*6*(1/2)=9; When p = 4, q = 2, CS = 1 * 2 * (1 / 2) = 1
2. Simultaneous supply and demand equation: q = 10, P = 4 / 3; Demand elasticity ed = - DQ / DP * P / Q = 3 * (4 / 3 / 10) = 2 / 5, supply elasticity ES = DQ / DP * P / Q = 6 * (4 / 3 / 10) = 4 / 5
3. (1) e = - DQ / DP * P / Q = 2 * [P / (10-2p)] = 1 / [(5 / P) - 1]
(2) let e = 1, then p = 5 / 2, when 0 & lt; p< 5 / 2, 0 & lt; e< Firstly, if there is no elasticity, the price should be raised to increase the total income; When P & gt; 5 / 2, E & gt; If it is flexible, it should rece the price and increase the income; When p = 5 / 2, the total income is the largest< br />(3)p=2：q=6 CS=3*6*(1/2)=9; When p = 4, q = 2, CS = 1 * 2 * (1 / 2) = 1
6. 1. It should be formatted with FAT16. 2. Can your camera be used with other cards? If you can't use it when you buy it, it's not a card problem
7. Calculation of price elasticity coefficient of demand: the meaning and expression of arc elasticity and point elasticity
(1) general formula of arc elasticity. In short, it represents the elasticity between two points on the demand curve
suppose that the two points on the consumer's demand curve for a commodity are a
and B
respectively, and the combination of price and purchase quantity is respectively
(p1q1) and (p2q2), then DP and DQ can be obtained immediately. However, when considering the percentage of price and demand changes, the results are different whether P1, Q1, P2, Q2 are selected. In order to solve this problem, economists have adopted a flexible but very effective scheme, that is, to take the midpoint of AB as the representative, so that the benchmark value of calculation will not change no matter whether it moves along the upper left or the lower right of the curve
(2) the midpoint formula of arc elasticity
a common problem is that the calculation result of arc elasticity from point a to point B is different from that of arc elasticity from point B to point a. In order to avoid this problem, scholars put forward the midpoint formula of arc elasticity
point elasticity measures the response degree of the infinitesimal change rate of price and the change rate of demand at a certain point on the demand curve
this elastic coefficient is only related to the slope DQ / DP of points (P
, Q
) on the demand curve, so it is called point elasticity, which can accurately reflect the elastic value of each point on the demand curve< Error 1,
the elasticity of demand for a certain commodity is a straight line,
then the elasticity between any two points is the same. X
elasticity changes along the linear demand curve
when moving up and left along the curve, the percentage change of demand increases (the benchmark value becomes smaller), while the percentage change of price decreases (the benchmark value of price becomes smaller). As a result, demand is becoming more and more elastic.
(1) general formula of arc elasticity. In short, it represents the elasticity between two points on the demand curve
suppose that the two points on the consumer's demand curve for a commodity are a
and B
respectively, and the combination of price and purchase quantity is respectively
(p1q1) and (p2q2), then DP and DQ can be obtained immediately. However, when considering the percentage of price and demand changes, the results are different whether P1, Q1, P2, Q2 are selected. In order to solve this problem, economists have adopted a flexible but very effective scheme, that is, to take the midpoint of AB as the representative, so that the benchmark value of calculation will not change no matter whether it moves along the upper left or the lower right of the curve
(2) the midpoint formula of arc elasticity
a common problem is that the calculation result of arc elasticity from point a to point B is different from that of arc elasticity from point B to point a. In order to avoid this problem, scholars put forward the midpoint formula of arc elasticity
point elasticity measures the response degree of the infinitesimal change rate of price and the change rate of demand at a certain point on the demand curve
this elastic coefficient is only related to the slope DQ / DP of points (P
, Q
) on the demand curve, so it is called point elasticity, which can accurately reflect the elastic value of each point on the demand curve< Error 1,
the elasticity of demand for a certain commodity is a straight line,
then the elasticity between any two points is the same. X
elasticity changes along the linear demand curve
when moving up and left along the curve, the percentage change of demand increases (the benchmark value becomes smaller), while the percentage change of price decreases (the benchmark value of price becomes smaller). As a result, demand is becoming more and more elastic.
8. Elastic computing means that users can flexibly purchase computing resources according to the actual business or computing needs. Truly realize on-demand use, on-demand delivery and on-demand payment
flexible computing reces the maintenance of cluster system for small-scale software developers, and the charging method is relatively simple and clear. Users only need to pay for this part of the resources how much they use. This payment method is different from the traditional hosting mode. The traditional hosting mode allows users to put the host into the hosting company. Users generally need to pay according to the maximum or planned capacity, rather than according to the usage. Moreover, they may also need to ensure the reliability and availability of the service, and pay more. In many cases, the service does not use full resources
the goal of elastic computing cloud is that the server image can have any kind of operating system, application, configuration, login and security mechanism that users want, but at present, it only supports Linux kernel. By creating their own AMI, users will upload AMI to the elastic computing cloud platform after completing this step, then call the application programming interface (API) to use and manage AMI. AMI is actually the image of virtual machine, users can use them to complete any work, such as running database server, building a platform for fast network download, providing external search services, and even renting their own AMI with characteristics to get benefits. Multiple AMI owned by users can cooperate with each other through communication, just like the current cluster computing service platform.
flexible computing reces the maintenance of cluster system for small-scale software developers, and the charging method is relatively simple and clear. Users only need to pay for this part of the resources how much they use. This payment method is different from the traditional hosting mode. The traditional hosting mode allows users to put the host into the hosting company. Users generally need to pay according to the maximum or planned capacity, rather than according to the usage. Moreover, they may also need to ensure the reliability and availability of the service, and pay more. In many cases, the service does not use full resources
the goal of elastic computing cloud is that the server image can have any kind of operating system, application, configuration, login and security mechanism that users want, but at present, it only supports Linux kernel. By creating their own AMI, users will upload AMI to the elastic computing cloud platform after completing this step, then call the application programming interface (API) to use and manage AMI. AMI is actually the image of virtual machine, users can use them to complete any work, such as running database server, building a platform for fast network download, providing external search services, and even renting their own AMI with characteristics to get benefits. Multiple AMI owned by users can cooperate with each other through communication, just like the current cluster computing service platform.
9. known Q = (100-P)& #178; * So dQ/dP = -2(100-P)
= dQ/dP * (P/Q)
= -2(100-P)* (P/Q)
(1)p=60 q=1600
= dQ/dP * (P/Q)
= -2(100-P)* (P/Q)
(1)p=60 q=1600
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