Extra points for solving the problem 4 questions 20 questions for one question, with the process o

1. (6+9) (9-6) = 5

5+1) 6=36 people.

A: There are 36 people in the class.

2. The first question: 300 (60-40) = 15 points.

A: A has 15 points to be in the same position as B.

Question 2: 300 (60+40)=3 points.

Answer: It takes 3 points for two people to be in the same position.

3. The last three digits are: (7000-7-864) (10-1)=681 Answer: 7681

2 3 = 72 square centimeters.

72 2 = 36 square centimeters.

36 2 = 18 square centimeters.

A: The area of the triangle CDE is 18 square centimeters.

The first question is set to have x people in the class, and there are y boats when there are exactly 6 people.

x=6y, 9(y-2) is greater than or equal to x, 8(y-2) is less than x, and 6 is less than or equal to y and less than 8

So when y is 6, x is 36, when y is 7, x is 42, the second question is equivalent to catching up with the problem. 1) 300 divided by (60-40) = 15 minutes, 2) 300 divided by (60+40) = 3 minutes.

Question 3. You're looking at the topic, and I personally don't think it's right.

The fourth question is to do the perpendicular line of BC respectively through a and e respectively q, m so the triangle caq is similar to the triangle cem, so ce is better than cb = em than aq = 1 to 3 and because cd is better than cb = 1 to 2, so the triangle ced is better than triangle = 2 1 times 3 1 = 6 1

So the area of the triangle ced = 18

The answer to the first question is 36 people, let the original number of ships be x, and the equation is 6 (x+1) = 9 (x-1).

Answered 15 questions correctly. Suppose you get all 20 questions right.

20x5=100 (points).

100-60 = 40 (min).

Wrong question: 40 (5+3)=5 (Channel).

Do the right question: 20-5=15 (Dao).

A: He answered 15 questions correctly.

Analysis] The key to this question is to master the method of hypothetical problem solving, you can assume that all 20 questions are done correctly, you should get 100 points, 40 points more than the actual one, and change the correct 1 question to do the wrong 1 question, it will reduce 8 points; 40 points, 5 questions are changed to mistakes, and there are 15 questions that are correct, and this question can also be assumed to be answered incorrectly.

If you get all these 20 questions right, then you get 20 times 5 equals 100 points, and now you get 60 points, that is, if you don't get 100-60 = 40 points, you will be deducted 5 + 3 = 8 points if you answer incorrectly.

In other words, Xiaoying mistyped 40 divided by 8 equals 5.

Then you get 20-5=15 questions right.

15 correct answers to 15 questions.

How do you understand the question?

Asked questions. One dollar at a time.

Ask a question to analyze this equation.

Let's get the answer X right.

5x-3 (20-x) = 60

5x ten 3x = 60 ten 60

8x=120

x=15

An important feature of mathematics is that it is widely applied, and the application cannot be divorced from reality. However, in recent years, when I paid attention to the tutoring problems of some mathematics competitions (in the past, I was mainly engaged in the education of mathematics high and middle school - non-ordinary high schools), I found that some practical application problems were made up through conjecture, or the answers were wrong, or the conditions were vague, or even the conditions set were wrong.

In this question, after "no answer, no points", "the minimum score is zero". When answering, consider answering correctly, and when you don't answer, you should get 40 0 points, a total of 11 grades. If there is a question that is answered incorrectly when answering 1 9 questions correctly, the score value of the (wrong) multiple of 2 will be deducted, because the same total score value is only counted as one, so only 9 different points will be added (that is, 2 points will be deducted for one wrong question), and the total score of other wrong questions will be the same as the previous score, so the answer is 20 kinds.

There are no correct options in the question.

If you add "the lowest score can be negative" (this is not possible in the actual rating). Well, the minimum score is -20 points. will add -20 -2 points to 10 scores. This makes up a 30 answer option. But it is contrary to reality.

The lowest score is -20 points, the highest score is 40 points, and the difference between similar scores is 2 points, so the number is [40-(-20)] 2=30

He got 7 questions right.

Solution: Suppose he answered question x correctly.

Then the incorrect answer is question (16-x).

Then according to the meaning of the problem, the equation can be listed as, 10*x+(-6)*(16-x)=16, and the solution of the equation can be obtained, x=7.

That is, a total of 7 questions were answered correctly.

Summary. 20 5 60) (5+3) 5 (questions) has 20 questions, 5 points will be added for one correct answer, 3 points will be deducted for one wrong answer, and the final score will be 60 points, and the question and answer will be correct.

Hello, I have seen your question and am sorting out the answer, please wait a while Oh Haven't you sorted it out yet?

20 5 60) (5+3) 5 (questions).

20 5=15 (question).

15 questions answered correctly.

The method of chickens and rabbits in the same cage.

And I'm rubbing this simple question, and the score distribution is 0-30 points, and everyone has a different score, which is 31 people, and it starts at 0, and then there are two people in each score, which is 62 people, and if you have one more person, you will have at least three people with the same score.

I think this question is all the way up to the total number of people and the total number of points. This question is not sufficient.

30 points for all correct answers, 10 points for all wrong answers.

Then see if all 41 integers between -10 and 30 are included.

When 10 questions are correct, the score may be 30===

When 9 questions are correct, the score may be 27,26===

When 8 questions are right, the score may be 24,23,22===When 7 questions are right, the score may be 21,20,19,18=== When 6 questions are right, the score may be 18,17,16,15,14=== When 5 questions are right, the score may be 15,14,13,12,11,11,10==== When 4 questions are right, the score may be 12,11,10,9,8,7,7,6===When 3 questions are right, the score may be 9,8,7,6,5,4,3,2===When the 2 questions are correct, the score may be 6,5,4,3,2,1,0,-1,-2=== [In fact, if you do half of it, you can see that 24 to 0 must be obtained, so just write both sides].

To sum up: the probability of a score is not 25, 28, 29. Therefore, there are 38 possible scores, and there are conditions for at least 3 people with the same score, so the number of people is at least 38*3=114 people.

One correct answer = 3 points.

One wrong answer = 4 points.

No answer = 0 points.

All pairs = 30 points.

All Wrong = 40 points.

I don't understand the relationship with the number of people!

It seems to be 3.

All 10 questions are 30 points.

All wrong is -10 points.

Every score in the middle is possible, so there are at least 40 different scores and at least 3 people with the same score, that is, at least 43 people.

The three of them are the same, and the least is three.

1 53/30 2 35/36.

3 6/5 4 27/56.

1+2+3+……9=45 45 divided by 3=15 Then the sum of horizontal, vertical, and oblique is 15.

A lot of possibilities, such as 8, 3, 4

The answers to questions 1 to 4 are 53 30 35 36 6 5 27 56

Assuming that all 10 questions are correct, the questions that are done incorrectly are:

4 (Questions), Answer: Answer 4 questions incorrectly

So the answer is: 4