Two math problems! Urgent! ~! 1、(a^2+ 1)^2-4a^2
=a^4+2a？ + 1-4a？
=a^4-2a？ + 1
2.x(x+ 1)-(x+ 1)(x- 1)
=(x+ 1)[x-(x- 1)]
=(x+ 1)× 1
=x+ 1
=20 12+ 1
=20 13
Related words! Urgent! Just that
Solve with inequality: urgent! 12x+40≤ 1000
12x≤960
x≤80
The average weight cannot exceed 80kg.
High second derivative practice is urgent! 12: g(x)=(x- 1)(x-2)...(x-2007)
f(x)=g(x)(x-2008)
f(x)'=g(x)'(x-2008)+g(x)
F'(2008) =g(2008)
=2007*2006*2005*...* 1
=2007!
This dog is getting smaller. Urgent! Tiny, if it's mild and doesn't cause bloody stool, then send it to the hospital as soon as possible, so that your dog will get well soon, about three or four days later. This is the case with my dog. A while ago, it was a little small. I was sent to the hospital for three days of injection and recovered after two days of rest.
During the treatment, it is best not to let dogs eat, and water can be drunk, as long as they are not forced to eat and drink. Go to the hospital for treatment every day, remember to infusion bag or bottle and supplement nutrition, because the dog has not eaten and lacks nutrition.
After a certain degree of treatment, if the doctor says he can go home to recuperate, you can take him home to recuperate and feed him directly. As long as you don't force it, you will eat when you are hungry. It should be noted that the amount should be well controlled, the weight is generally 40% before illness (personally, feed dog food, not people, if you have to rely on people to eat, use porridge, light), and the water should be clean.
Slowly, your dog will recover. During this period, the food intake slowly returned to the original amount and increased to the original amount day by day.
I wish your dog a speedy recovery and a happy New Year.
50 years later, my feelings after the composition exam.
Generally speaking, this exam can be described by three words that Gou Ge (our Chinese teacher) commented on our composition: "The listener is sad and the viewer is crying, which is terrible!" I held my breath at the moment when the test paper was handed out. I was stunned by the two bright red figures in front of me. God, my Chinese has made a historic breakthrough! One step away from failure. This achievement is unprecedented, but I don't know if it is unparalleled.
As the saying goes, as you sow, you reap. I earn my own living. If I know today, why should I know? The ancients said: "The wind is rustling and it is easy to get cold." Today, I sighed: "The exam is over, I'm finished!" It's never too late to mend. I can't believe that I, who thought I was excellent, would be in this situation. Speaking of reasons, there are many. One is also the most important, of course, is that you don't know how to work hard and have no persistent fighting spirit. Only those three minutes of heat. These bad habits are the main raw materials for failure. Of course, through the ages, everything that can be achieved is inseparable from the integration of weather, geography and people. The goddess of fortune left me this time and didn't get her favor. How can she not fall into the abyss of failure? How high you can climb, how deep you can fall. I've realized that.
Pick up the test paper and look at it, shocking! Staggered forks are like handfuls of extremely sharp bayonets, which make me suffocate. It should be right, but it is not. Should be right, but it's not. There will be a family table tennis match tonight, men's singles, women's singles or mixed doubles. Ah, my life is over!
The quiz exposed my inner complacency and arrogance. Let me know how small and fragile I am in the crowd! This is a small punishment for me, which sounded the alarm and gave me a vaccination in advance. A failure is nothing, and failure may be a precursor to success. One success proves nothing, it will eventually become history. We can't predict the future, we can only rely on our own efforts to expect fruitful results!
Work hard, there is not much time left. ...
Experience 1:
1, you might as well set yourself some time limits. It's easy to get tired of studying for a long time. At this time, you can divide your homework into several parts and limit the time of each part, for example, finish this exercise within one hour and finish that test before eight o'clock. This will not only help to improve efficiency, but also avoid fatigue. If possible, gradually shorten the time used, and soon you will find that the homework that you couldn't finish in an hour before is now finished in 40 minutes.
2. Don't do other things or think about other things while studying. Everyone knows that you can't do two things at once, but there are still many students who listen to music while studying. Maybe you will say that listening to music is a good way to relax your nerves, so you can concentrate on studying for an hour and then relax listening to music for a quarter of an hour, which is much better than doing your homework with headphones on.
Don't review the same lesson all night. I used to spend an evening watching math or physics. Practice has proved that it is not only easy to get tired, but also has a poor effect. Later, I arranged to review two or three classes every night, and the situation was much better.
You don't need to take detailed notes in class except for very important content. Busy taking notes in class will be inefficient, and there is no guarantee that you will take notes after class. The main work in class should be to digest and absorb the teacher's lecture content and make some brief notes appropriately.
Experience 2:
I have also talked to many people about learning efficiency. We often see such a situation: a classmate studies very hard, studying at school, studying at home, sometimes staying up late and doing countless problems, but his grades are always not up. In fact, I am also very anxious in the face of such a situation. Originally, what you paid should be rewarded. Moreover, if you pay more, you should get a lot of rewards. This is a natural thing. But this is not the case. There is an efficiency problem here. What does efficiency mean? Just like learning, some people will practice it ten times, while others need to practice it a hundred times. There is an efficiency problem.
How to improve learning efficiency? I think the most important thing is to combine work and rest. What is most needed to improve learning efficiency is a clear and agile mind, so proper rest and entertainment is not only beneficial, but also necessary, which is the basis of improving learning efficiency. So how to improve the efficiency of class? In my experience, it is necessary to preview before class, but my preview is rough, and I only glance at the teaching materials, so that the contents and key points of the teaching materials are roughly in my mind and I can be more targeted when I attend classes. When we preview, we don't need to be too detailed. If we are too detailed, it is a waste of time. Second, I will be a little lax in class, and sometimes I will ignore the most useful things. It is of course necessary to listen carefully in class, but as one of my former teachers said, no one can concentrate in a class, which means it is impossible to concentrate for more than 40 minutes, so there is also a problem of time allocation in class. Teachers can relax when they talk about familiar things. In addition, taking notes sometimes hinders the efficiency of class. Sometimes a class is busy copying notes, and sometimes something very important is ignored, but this does not mean that you can not take notes, which is not enough. Everyone will forget that with notes, there will be a basis for review. Sometimes the teacher talks a lot and writes a lot on the blackboard, but you don't need to remember them all. Of course, you should remember some books. Otherwise, remember what you see, which will inevitably affect the efficiency of class, and the loss will outweigh the gain.
How to improve the efficiency of doing problems? The most important thing is to choose a "good topic", and never do it as soon as you see it, which will often get twice the result with half the effort. The questions are all around knowledge points, and many questions are quite similar. First, choose the knowledge point you want to strengthen, and then choose the questions around this knowledge point. There are not many problems. Just a similar question is enough. After choosing the topic, you can do it seriously. The improvement of problem efficiency largely depends on the process after the problem is solved. For the wrong question, we should seriously think about the cause of the error, whether it is because the knowledge points are unclear or careless. After the analysis, do it again to deepen the impression, so that the efficiency of doing the problem will be much higher.
Comments: Yu Xia's suggestion on attending lectures and doing problems actually reflects an important method to improve learning efficiency-"keeping your strength on the cutting edge", that is, allocating time reasonably, paying attention to key points when attending lectures and taking notes, and grasping typical examples when doing problems, which is "getting twice the result with half the effort" in learning.
Experience 3:
Learning efficiency is an important factor in determining academic performance. So, how can we improve learning efficiency?
First, confidence. Many scientific studies have proved that human potential is great, but most people have not effectively developed this potential. Among them, people's confidence is a very important aspect. No matter when and where you do anything, with this confidence, you will have the belief of winning, and you will soon get rid of the shadow of failure. On the contrary, if a person loses self-confidence, he will accomplish nothing, and it is easy to fall into eternal inferiority.
Another important means to improve learning efficiency is to learn to concentrate. The process of learning should be a process of thinking with the brain. Whether you look with your eyes, read with your mouth, or copy by hand, they are all means to help your brain. The real key is to think with your head. Give a very simple example, such as memorizing words. If you just browse or copy aimlessly, it may take many times to remember, and it is not easy to remember. But if you can give full play to your imagination and use the method of association to remember, you can often remember quickly and not easily forget. Nowadays, the method of memorizing English words quickly introduced in many books also emphasizes brain association. It can be seen that if we can concentrate 7 times and give full play to the potential of the brain, the learning effect will definitely be greatly improved.
Another important factor affecting learning efficiency is people's mood. I think everyone has had this experience. If one day, he is full of energy and spirit, he will feel relaxed and learn quickly. In fact, this is when we learn efficiently. Therefore, it is very important to maintain a good self-emotion. In daily life, we should have a more cheerful attitude, don't think too much about things that are not satisfactory, and treat people and things around us with a warm and optimistic attitude to life, because it is very beneficial to others and ourselves. This can create a very relaxed atmosphere around you, and you will feel particularly energetic when you study.
English translation (urgent! There are several pauses in this famous piece of music. At every pause, his hand left the piano and waited. For him, this is very exciting. But it seems that this is unusual for a girl of 10 to rank fifth. She thinks the boy has forgotten the tune. She is very worried about him. Finally, during a pause, she walked up to him with a bunch of flowers. She presented the bouquet to him and said softly, "Don't be nervous, you will remember this song."
The first grade English question, urgent 1 funny 2 big 3 fun.
Fill in the idioms according to the meaning. In a hurry, in danger, in danger, in danger, in danger, in danger, in danger, in danger, in danger, in danger, in danger. Autumn: autumn. Describe it as dangerous, it will collapse soon, or it will collapse soon if it is unstable. The origin of the idiom: Ming Luo Guan Zhong's Romance of the Three Kingdoms, the 104th time: "When people look at it, they can see that its color is dim and shaky." Example of idiom: The soldier looked down near the edge, dizzy, and felt that the big stone in front was shaking back and forth, and his body was ~. (Qu Bo's "Lin Yuan" Erqi)