Chapter 122

Cheng Nuo's speed is very fast.

The first ten multiple-choice questions and the last five fill in the blank questions, Cheng almost did not spend much energy, in about ten minutes to complete all.

The last six questions. They are trigonometric function, solid geometry, probability, sequence, analytic geometry and derivative.

All of them are common in the examination, but the difficulty depends on the level of the teacher.

Obviously, Mr. GE's ability to work out questions has been tested by several generations of people, and he is absolutely as difficult as he can be.

Within the scope of the examination, try to make the most difficult questions!

This is Mr. GE's criterion.

I'm not afraid to die, but I'm afraid I won't cry!

Cheng Nuo shrugged his shoulders, turned the paper to the back, drank his mouth comfortably, and then pulled the draft paper that had not been moved to him.

Big topic, let's go!

Let f (x) = sin (Wx - π 6) + sin (Wx - π 2), where 0 is less than w and less than 3, and f (π 6) = 0

(1) find w

(2) lengthen the abscissa of each point on the image of function y = f (x) to twice of the original (the ordinate remains unchanged), and then shift the obtained image by π 4 units to the left to obtain the image of function y = g (x), and find that G (x) is in the range of [- π 4, 3 π 4 】The minimum value on the

This is a very basic trigonometric function.

Cheng Nuo doesn't even need to calculate on scratch paper. Work out the correct steps directly in your brain.

The rest, Cheng Nuo only need to do is copy the answers in his mind on the answer sheet.

…………

The examination time is passing by minute by second.

In two hours of math exam time, even if you take out a set of test papers with ordinary difficulty for examinees to do, before the bell rings at the end of the test, no matter whether they are right or wrong, they can finish all the questions on the test paper. I'm afraid that 10% of the candidates can finish all the questions on the test paper.

Not to mention this year's set of topics. Compared with previous years, I don't know how many grades are higher.

Even if the grade examination is often the top few of the school bully group, even do not have 50% confidence, can complete all the questions.

Even Lao Tang, a few days before the exam, specially said to the people in class 18.

If the math test paper is too difficult, try to pick up what you can do. Can not do the topic, do not iron head baby, do not regret, directly skip! It's not the same as the test paper.

If there's still time left in the end, go back and try it. If you don't have time, just write something and get a formula score.

Finally, a big problem, strategic give up!

Generally speaking, the difficulty of the last big question is the most difficult one in a set of papers.

The first question is still normal. If you calculate, you can still work it out. As for the second question

Direct can make you doubt life!

There are so many delicate questions in the final part of the paper that no math bully is bent down! It's not just a joke.

…………

Time came to the 30th minute.

While other candidates are still struggling to choose or fill in the blanks, Cheng Nuo has come to the last question.

This is a question about derivative.

"The function f (x) = (X-2) e ^ x + a (x-1) ^ 2 has two zeros.

(1) BR) let x (2) be less than the range of zeros (x 2)

At first glance, this problem is very simple, and the conditions and questions given are very concise. In fact, it's not very difficult to calculate the first problem.

But

He let him be strong, take him as skin!

He let him be horizontal and treat him as the skin of a melon!

Cheng Nuo got the true story of melon skin Dafa.

In front of him, all mathematical problems are nothing.

"This problem directly uses Lagrange's mean value theorem, plus Taylor's formula of payano's remainder, and then..."

Cheng Nuo is calculating in his mind and murmuring.

It is worth mentioning here that after some reform, the college entrance examination system allows candidates to use solutions outside the high school syllabus when answering science questions.

Take a chestnut.

As we all know, lopeda's law is a law of seeking limits.

The value of the indeterminate formula is determined by the limit value of the derivative of the numerator and denominator respectively.

In the derivation problem, the problem of finding the limit after comparing two numbers is very common.

If you use the law of lobida, you can easily get the answer.

But

Lophida's law is not within the scope of the high school syllabus, but a formula learned in college mathematics.In the past, the lophida rule was not allowed to be used in the college entrance examination. Once used, two points will be deducted.

But it's very painful that if you don't use this lophida rule, it will take a lot of calculation steps and time to solve the answer in a very complicated way.

More time or two points?

This is a dilemma for Xueba.

However, after the reform, this situation did not exist.

College entrance examination questions, you can use the knowledge of the university to do. Even if you can, you can do it with the knowledge of graduate students!

However, if we do so, we have to bear certain risks.

If the answer is right, it's OK to say that the marking teacher will look at your problem-solving steps and see if the super class knowledge is reasonable.

The answer is not right. Sorry, even if you use the knowledge in front of you well and perfectly, it is still Zero!

Because if the result is wrong, the marking teacher will not carefully look at your problem-solving steps, let alone have the spare time to study which formula you use.

So, unless there is really not enough time, in order to save time, some people will try to use the knowledge beyond the outline.

But Cheng Nuo is good, not only used, and a use is almost a whole paper. There is no fear that the answer will be zero.

……………

"End, stop!"

Cheng Nuo left the last pen on the test paper, put down the pen, and slowly put the paper neatly on the table top.

Hands in the field of Dan slowly press down, gently exhale a breath.

Look up and look at the time, 15:41.

It's only 41 minutes since the beginning of the exam.

Cheng Nuo looked around the examination room for a week, and found that almost all the candidates were lowering their heads. Some were scratching their ears and scratching their cheeks. Some were sweating and writing on the draft paper. Anyway, none of them showed a very relaxed look.

Cheng Nuo moved the chair back, found a very comfortable position to lean on the back of the chair, cocked up his legs, picked up the thermos cup on the windowsill, unscrewed the cap of the bottle, gently blew the hot air, and sipped it.

"Ah ~ ~"

Cheng Nuo gives a comfortable light song and squints his eyes. He looks comfortable and can't be more comfortable.

………………

PS: the less than sign is harmonious by the point mother, can only use words.

The story of college entrance examination will end tomorrow!

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