Kind people, come and help me!!!!!!!!

Hehe, this one is kind of interesting.

3 people spent 27$, of which 2$ was swallowed by the younger brother, and the remaining 25 was given to the boss, that is to say, the 27$ spent included the younger brother's 2$, which took advantage of the initial 30$ to confuse the person who saw the problem.

from"The next day, the boss felt that only $25 was enough for three rooms, so he asked the younger brother to return $5 to the three guests"Learned ==>

25 3 = yuan.

from"Only $1 per person will be refunded"I learned that each person added another dollar. It's equal to 28+ 2 yuan for guys, just 30

The algorithm is incorrect: 3 people spend $27 minus the younger brother's $2 to pay $25

Or $25 for 3 people plus $3 returned plus $2 for the younger brother, which is equal to $30 for 3 people first

The three of them spent a total of 27 yuan, and the 27 yuan has been included in the part that the younger brother swallowed alone, and it cannot be counted twice.

25 yuan is the room fee, 3 yuan is returned to the tenant, and 2 yuan is the younger brother's exclusive possession. Therefore, 27 yuan is composed of two parts: 25 yuan for the room and 2 yuan for the part that the younger brother swallows alone.

So there won't be any extra $1 at all.

I think if you think the other way around, you pay 8 yuan per person, a total of 24 yuan, plus the one yuan per person returned by the younger brother, it is exactly nine yuan per person, and plus the 2 yuan of the younger brother and 1 yuan from the boss, it is exactly 30 yuan, so that one yuan is still at the boss!

Because even if you refund the guests one dollar per person, it doesn't mean that they spent nine dollars, because 10-(5 3) = inexhaustible), my expression is not very clear, in short"This means that the three guests each spent nine dollars"It's not right.

That's right:

The three of them paid 30 yuan first, and then the boss returned 5 yuan, and paid 25 yuan, and the younger brother was greedy for 2 yuan, 25 + 2 = 27, and the three paid 27 yuan.

You're misleading, they spent $28 instead of $27.

27。I knew it a long time ago!

1. Read the sentence and complete the exercise.

The corridor is more than 700 meters long and is divided into 273 rooms.

1.This sentence uses the method of (column numbers) to write the characteristics of the corridor (long) and (multi-spaced).

2. Write sentences as they are For example: Directly in front, Kunming Lake is as quiet as a mirror and as green as a piece of jasper.

There are so many stars in the sky that they resemble (innumerable eyes) and shine like sparkling diamonds.

The river looks like a (boundless ribbon) and is as clear as a flowing crystal.

1.This sentence uses the method of (column numbers) to write the characteristics of the corridor (long) and (wide).

1.Fill in the first book title number with the appropriate operator symbol, and the second book title number with the appropriate number.

2.If the two numbers are divided, if the dividend is multiplied by 100 and the divisor is divided by 10, how does the chamber change?

The quotient expanded to the original: 100 10 1000 times.

3.The dividend is 600The divisor is 25If the dividend and divisor are multiplied by 100 at the same time, the quotient is (24).

4.In the division equation 120 20=6 If the dividend is divided by 5, the quotient remains 6, and the divisor should be (also divided by 5). -

2.If the two numbers are divided, if the dividend is multiplied by 100 and the divisor is divided by 10, the chamber increases tenfold?

3.The dividend is 600The divisor is 25If the dividend and the divisor are multiplied by 100 at the same time, the quotient is (unchanged, 24).

4.In the division equation 120 20=6 If the dividend is divided by 5, the quotient should remain 6 so that the divisor should be (divided by 5).

I'm a college student, majoring in science and engineering, and I had a similar experience with you when I was in junior high school. I would like to say.

First of all, you have to have a correct attitude, no matter what discipline you study, you must be diligent and hardworking.

Then your math score is good, which proves that your logical thinking ability and spatial imagination ability are still good, and the rest is not a problem if you learn the math tools well. The key is the way.

Chemistry is really not that difficult, memorization still accounts for most of it, you have to read more, many times, read more, memorize more, and do some classic exercises appropriately.

Physics, this subject is difficult to learn well, I advise you to first understand the theorems and formulas in the book, how to understand the ability, is to do exercises that clearly reflect its thoughts, I don't care how much to do, what I care about is to think, from the positive and negative paradoxes to master the truth skillfully.

If you understand the question thoroughly, your thoughts will naturally be understood.

As for the test, the first few processes are generally the memory part, you just endorse it, and the calculation steps are mainly to test your ability to actually use knowledge, and there will be no problem if you do the points I mentioned earlier. However, when it comes to experimental questions, you have to be careful, write standardly, and be logical and rigorous, I believe that as long as you are trained, you can.

I hope my advice can help you.

Some physics problems are common sense, the application of problems to replace formulas, experimental problems such as connecting circuits, measuring pressure, measuring density are very simple, optics and mechanics can not be wrong, chemistry must be calculated. In fact, there are no skills, listen carefully in class, and if you don't know it, you must figure it out.

It seems that you are a junior high school student, it is inevitable that you study very hard, I also survived like this back then, I heard you say this, your math score is good, so you just need to keep this course math problems still have to be done more As for physics and chemistry Your problem is mainly that you are not flexible enough to do the questions You are rote memorization It is not enough to memorize formulas and equations You have to review it comprehensively Dredging the knowledge points in the book and then doing some exercises to consolidate it This should be better I wish you a good result in the high school entrance examination.

I feel that this is a matter of personal comprehension, I was mediocre in math and chemistry, but physics was surprisingly good, and I can't say why. Anyway, it has nothing to do with intelligence. Let it be, just have a clear conscience, why force it?

In addition, you must be cautious when dividing subjects in high school, don't think that science is difficult to learn and choose liberal arts, no one is easier than the other!

Be able to use flexibly, learn to pay attention to methods, not blindly study, combine work and rest, and don't blindly pursue high scores and learn to be ashamed to ask questions. This will naturally give you a high score.

Find out which part went wrong and memorize them all!

It is not difficult to really review after class, really listen to lectures in class, and get high scores.

Attend classes well, but you really can't go to cram school, you can't have something that you don't understand.