Xi Suanli

1. Do you say PC? In my opinion, any computer has the ability of parallel computing. It depends on how you define it. Parallel computing and distributed system are both computing methods, not hardware specifications

each task in your operating system has a process, and each process is composed of many threads. If you've ever had an operating system class, you should have met multi threads programming. You let different threads cooperate to complete the same task, which is actually called parallel computing and distributed processing.

you can see that the projects of those parallel computing classes also run algorithms with ordinary computers, The key point is that you will simulate this environment. Just like those who run network algorithms use socket to simulate, they also use a PC to simulate the network of N workstations.

if you say multi-core CPU, First of all, you don't have access to the firmware of ordinary motherboards. So you have to buy a programmable board of general purpose, But if you want to buy a multi-core basic, you can't find it... Only in the laboratory can you have it... Even if you find it... I think that the money for that board is estimated to be several times of the tuition for you to go to graate school and then enter the laboratory...

in a word, if the software is implemented, today's PC should have no problem, As for how to start parallel computing mode, you need to read the datasheet of this board.

I don't agree with the above saying that there must be two cores, People with two brains can do parallel. But the left brain and the right brain of one brain are also parallel. When refining different neurons, the other completely independent neuron is also parallel. Parallel is a way to solve problems, an idea. Parallel computing was first proposed in 1912. I can't remember when the multi-core processor appeared, But after 2000, at least

2. Hello, building owner. Now bitcoin has fallen to such a low level that there is no profit in mining, and the computing power has not declined, but it is still rising
these are illusory things, so work hard!

3. At the programming level, first of all, 1, 2 and 3 are binary shaping variables
my understanding is that binary operation is more convenient than 99 multiplication table
high and low levels (voltages) are easy to express and difficult to make mistakes, but if you want to divide them into a series of different voltages... It's a thankless thing demanding high cost and hard work. In short, it's money burning. It will also be very expensive. Will you buy it They are simple to work with -- no big addition tables and multiplication tables to learn, just do the sample things over and over, very fast.
they just use two values of voltage, magnetism, Or other signal, which makes the hardware easy to design and more noise resistant.
for computers, binary numbers are great things, because:
they simply work together - there is no big addition table and multiplication table to learn, just do the same thing over and over again, very fast
they only use voltage, magnetic, or other signals, which makes the hardware easier to design and more noise resistant. It's all binary numbers in essence - let's say it's an 8-bit representation (16 bits plus 8 zeros), This is the computer's view of 1 -- 00000001 - = 0 + 1, this is the computer's view of 2 -- 00000010 - = 2 + 0, this is the computer's view of 3 -- 00000011 - = 2 + 1, binary addition by bit: case1:0 + 0 = 0case2:0 + 1 = 1 + 0 = 1case3:1 + 1 = 0, and carry
it can be written in loops, but there should be a faster way. Let's explore the following: case 1: same case 2: different case 3: same but carry. OK, we have found the rule we want. Without considering carry, it is an XOR operation, and carry itself is an and operation. Starting from the digital circuit, there are: truth table:
then the circuit design is as follows: first place addition (considering the output carry):

General addition considering the bit to be added:

multi bit addition: multi bit addition:

4. Your situation is universal and not a big problem. My friend also had a similar problem. She said that when she was in primary school, she hit the top 100, junior high school was also very good, and when she was in senior high school, she was full of loopholes. The knowledge of high school needs relatively complex calculation. There are many factors to be considered in physics and mathematics problems. In fact, it is not "the decline of calculation ability", but too many factors interfere so that the energy of sharing calculation is occupied. Like watching movies and playing games on the computer, the picture quality of the game is much worse than that of the movie, but the game may be the computer crash. That's because computers have more to deal with than "picture quality.". It's the same with your calculations. In fact, it's not just the problem of the topic itself. In the process of growing up, people care about more and more factors. These things may be the interference of your calculation

how to solve it? In addition to more practice, there is no other way, but practice is not blind, to high school to do a problem to have a purpose, before doing a problem, we should first clear what this problem needs to pay attention to: for example, your calculation is easy to make mistakes, then write it step by step; If it's easy to get the title wrong, read it over and over again and tick out the main points. Do a problem to have the value of a problem, what you have to improve, what progress you have to be clear. College entrance examination is to let people become a machine to do questions, and practice makes perfect is the only choice

however, I said that "the machine of making questions" is not the only purpose of high school, but only one of the important purposes of high school. Whether you are a good learner or not does not depend on whether you are a question machine, because everyone is the winner of the college entrance examination. It's about how you become a problem machine. If you are purposeful, what adjustments have you made for the calculation errors, and what efforts have you made for the reading errors, then you can say that you are a good learner; On the contrary, if it is a headless and fly like tactics, then even the number one in the college entrance examination is useless

practice more, prepare the error book (even if it's careless, it's also your weakness, you should know where you are prone to make mistakes, you should write it down), do the problem purposefully (don't care whether you can finish it, care whether it's valuable to finish it), and communicate with teachers and friends more (not just study, don't sink in the sea of problems)

my classmate who has similar problems with you has 300 students in grade one and grade two of senior high school for a long time, and the students in grade three suddenly become less than 100, so he went to Zhejiang University for the college entrance examination. This is part of the experience she told me. I hope it can help you.

5.

In theoretical mechanics, Q stands for the action density of uniform load, which means the uniform load within the action range. The calculation method is as follows:

1. The uniform load can be equivalent to the force by integral method, and its size is equal to the area of uniform load, and the action point falls at 1 / 3 of the length near the bottom according to the moment equivalent method

6. A football coach who knows tactics doesn't necessarily play well. This student may have a high level of mathematical thinking. When you talk about mathematical multiplication, it won't affect his way of thinking. Analytic geometry can be completely transformed into mathematical calculation! Generally, it is an algebraic operation, and the specific details are the multiplication calculation. If the oral calculation is not enough, can it be written! And we should learn how to think in detail! Not every topic of a process to think very detailed, in the brain to mark their own known and unknown is good! The calculation ability of the number is not necessarily that of the letter!