My sister is in elementary school this year and wants to learn Olympiad mathematics, where is the cl

What grade is your sister in?If the lower grades can learn gradually and systematically, if it is already the fifth or sixth grade, in order to cope with the small promotion to the junior high school, you have to assault, Hui Gengsi's teacher Niu is very good, my child is now in the fourth grade, on his gold medal class, last year the four students in their gold medal class were recruited, it is really a good class.

Hello, you can consider Xueersi Education, as well as Zhikang 1-to-1

I have been studying Olympiad Mathematics since Primary 4, and I feel that the time is quite appropriate, and the time should not be too early. Mathematics Olympiad can exercise my thinking, which is a great help for my middle and high school mathematics learning. Because of the training in primary school, the second prize in Jiangsu Province in the sixth grade and the two first prizes in the first and third years of junior high school enabled me to successfully enter the middle school.

I also got a perfect score in math in the high school entrance examination. Hehe, I was brave back then. I am very grateful for the Olympiad in primary school because I have to spend my extracurricular time on that, and luckily it only starts in the fourth grade.

However, I want to emphasize that learning this thing really requires interest, and the person who learns must gain some sense of accomplishment or self-confidence from it. If you're not that material, it's better not to learn, it's counterproductive. In my experience, the first step in learning mathematics in secondary school is to be careful rather than intellectual.

I've seen too many cases of low scores because of intelligence. Since childhood, many people have been competing for the Olympiad, but students are eliminated round by round, and the time spent being eliminated has been wasted. In fact, if parents have enough ability, they can buy some suitable teaching materials, not too difficult, give their children one or two questions every day, and exercise their thinking.

If you must take the Olympiad, don't look at the ones who charge a lot of money, but look at teachers with good reputations, preferably those who work in schools, because they have enough experience.

It's better to go to Longling School to study.

Go check it out, maybe it will help you.

1、（6-2）*（10-2）=112

3、m=25*18/15=30(cm)

4 = 3 square meters 3-1 = 2 meters 2 * 2 = 4 square meters -2 * 5 = 56 square centimeters 56 (2 + 5) = 8 centimeters 8 + 2 = 10 centimeters 13 * 10 = 130 square centimeters.

6. = Uh, this is the answer to "The Area of Rectangles and Squares" (Basic Volume).

I'm sorry, to be honest, many people want to have all kinds of answers, but it's generally impossible to have them, and it's good to post if you don't understand something.

Draw inferences from one another, it was published by the Shaanxi People's Education Publishing House, and if you go to the small bookstores around the school to take a look, there should be.

Well, I don't have that book, you send me the question, and I'll give you the answer.

Xiao Li has 5 ballpoint pens, Xiao Ming has 4 pens, a total value of 44 yuan, if Xiao Li and Xiao Ming exchange a pen, then the value of the pen in the hands of the two is equal, how much is 1 pen and 1 ballpoint pen?

Solution: 4 ballpoint pens + 1 fountain pen = 1 ballpoint pen + 3 fountain pens So: 3 ballpoint pens = 2 fountain pens.

Then, 4 fountain pens = 6 ballpoint pens.

** of ballpoint pen: 44 (5 + 6) = 4 (yuan).

** of the pen: 3 4 2 = 6 (yuan).

A: $6 for 1 fountain pen and $4 for 1 ballpoint pen.

The school bought back 30 balls and 60 skipping ropes, paid a total of 300 yuan, it is known that the price of each ball is 3 times that of each skipping rope, and the ** of each ball?

Solution: ** of one ball = ** of 3 jump ropes, then ** of 60 jump ropes = ** of 20 balls.

The ** of each ball is: 300 (30 + 20) = 6 yuan Answer: **6 yuan per ball.

The first question uses the idea of conversion: after exchange: 4 ballpoint pens + 1 fountain pen = 3 fountain pens + 1 ballpoint pen.

After the left and right exchanges: 4 ballpoint pens - 1 ballpoint pen = 3 pens - 1 pen 3 ballpoint pens = 2 pens.

5 ballpoint pens 4 yuan = 20 yuan, so Xiaoli's ballpoint pen is a total of 20 yuan 44-20 = 24 yuan, and then use 24 4 = 6 yuan··· The price of each fountain pen is 4 yuan per ballpoint pen and 6 yuan for fountain pens.

If you don't understand this method, there is a second one, which is the column equation.

Set each ballpoint pen x yuan, then each fountain pen is (44-5x) 4 yuan by exchanging 4 ballpoint pens + 1 fountain pen = 3 fountain pens + 1 ballpoint pen, so 4x (4 ballpoint pens) + (44-5x) 4 (a fountain pen) = 44 2x solution 4 yuan··· The price of a ballpoint pen.

After substituting (44-5x) 4, you can get out how much a pen is You look at the situation, you can write which one you understand, I think you are in the 6th grade, you should know the second kind! You can teach your sister.

The second question, set the index, set each skipping rope x yuan, then each ball is 3x yuan, therefore: 60x+90x=300

150x=300

x=2··· The price of each jump rope.

Then substitute 3x to calculate how much each ball costs.

Solution: 4 ballpoint pens + 1 fountain pen = 22 ......(1) 5 ballpoint pens + 4 fountain pens = 44 ......（2）

1) *4 gets: 16 ballpoint pens + 4 fountain pens = 88 ......(3) (3) - (2) obtained: 11 ballpoint pens = 44

1 ballpoint pen = 4 yuan Substitute (1) to get:

4 * 4 + 1 fountain pen = 22

Fountain pen = 5 yuan.

Solution: **:

300 (30+60 3)=6 yuan.

I've been studying for more than 4 years, so I'm a senior and make a few suggestions.

First of all, it is necessary to choose a good class and a good Olympiad book. Extracurricular classes are still good for gifted education, giants and learning, and the effect is not very obvious. As for the Olympiad book, I suggest that the thinking guidance from Renhua School is very good, but I suggest that you read Lingke's "Detailed Explanation of Thinking Guidance", and you don't know how to have an answer.

When you take the Olympiad class, you must understand what the teacher says before you go home, and you would rather not take all the notes, rather than leave knowledge loopholes, and actively ask and destroy the teacher if you don't understand.

Then I have to go home and take some time, even if it's one day of the month. On this day, you will do it with the Olympiad book, and do about 5 questions per lecture, from easy to difficult. You must finish this book, you can't understand it, and you can fully grasp the ideas of each question.

I did my best on the Sunday before the Olympiad exam with a mind guide, and I also made a few lots, and I did a few numbers when I drew a few questions, and the results were very effective!! I took the first place in Class A, and I came up from more than a dozen people. o(∩_o~）

After that, you should adjust your mindset and invest in your interests.

That's no problem!!

from Yao Jia, a junior high school student

First of all, of course, I'm not afraid of hardship, but talent is also needed, but I think interest is very important.

Do more by yourself, I really don't ask the same thing, there is no genius in the world, only stupidity.

1.Armor. B has two oil storage tanks, A has less oil storage than B, and 1 6 of 1 4B is input into A, and the oil storage capacity in A is 2 tons more than B. How many tons of oil is B. B?

2.The factory organized 400-450 people to participate in the tree planting activities, with an average of 32 trees planted per person. On average, 48 trees were planted by male employees and 13 trees were planted by female employees. Men who participated in the tree planting. How many women are there? (Calculate the number of people in proportion).

3.Armor. Second. Warehouse C 3 has 120 pieces of disaster relief materials, A has 120 pieces, and B is A. The sum of the two warehouses of C, C is A. Half of warehouse B, how many pieces of disaster relief materials are there?

4.Armor. Second. A total of 500 televisions were installed in Group C3. Armor. The ratio of the number of assembly units in the two groups of B is 5:3, and C is 39 units less than B. How many units are there? (Assuming that C is installed with 39 more units).

5.Armor. The distance between the two places is 243km, and a truck and a passenger car are traveling from A at the same time. The two places set out, walked in the opposite direction, and met after hours. The speed ratio of a truck to a bus is 4:5, so how many hours does it take for a bus to complete the journey? (both methods).

6.A daily chemical plant produces 9800 pieces of laundry soap, which is 5 more than 9How many boxes of laundry soap and soap are produced? (Variation rate clever solution).

7.Students from two teams A and B set off at the same time from two places 2700 meters apart, walking in opposite directions, a student riding a bicycle at a speed of 150 meters per minute between the two teams non-stop back and forth, team A traveled 25 meters per minute, team B traveled 20 meters per minute, when the two teams met, how many meters did the students on bicycles travel?

Traveling the same distance, car A takes 5 hours, car B takes 4 hours, car C takes 3 hours, and now car A, B and C drive from the same place in the same direction for 5 hours, car B is 100 kilometers ahead of car A, so how many kilometers is car C ahead of car A after 9 hours?

From the inscription, we know that the velocity ratio of A, B and C is 1 5:1 4:1 3=12:15:20

If car A travels x kilometers for 5 hours, then car B will travel (x+100) kilometers, 12:15=x:(x+100) x=400 kilometers and car B will travel 400+100=500 kilometers.

A speed 400 5 = 80 km/h.

Then set the speed of C to x, 12:20=80:x=400 3

After 9 hours, car A 80 * 9 = 720 km C car line 400 3 * 9 = 1200 km.

After 9 hours, car C is 1200-720=480 kilometers ahead of car A.

One bacterium, one minute, its number is *2, two minutes is *2*2, 10 minutes can bar, a bottle is full, now put a bacterium in a bottle (the bottle is the same size), ask a few minutes later, the number of bacteria has been put half of the bottle.

A: 9 minutes.

Pick me.

..It shouldn't be of much use to cramming for a while. (My point of view) still have to rely on the usual accumulation, to practice more and think more, in order to improve their thinking agility, now I want to rely on a test paper to improve the competition results, I'm afraid it's difficult.

There are all kinds of math problems in this **. Wish.

The tutor who tutors the Olympiad in primary school recommends going to Jinghan to try it, Jinghan's one-on-one is still very good, you can find ** to consult first.

The tutor who tutors the Olympiad in primary school recommends trying the one-on-one tutoring of Xueda, which is very good, you can go to ** consultation first.

If there are more than 2 cards, there are 4 types.

10 + 5 = 15 yuan.

10 + 1 = 11 yuan.

10 + 5 + 1 = 16 yuan.

5+1=6 yuan.

If you count one, there are 7 types.

$10 $5.

1 yuan, 10 + 5 = 15 yuan.

10 + 1 = 11 yuan.

10 + 5 + 1 = 16 yuan.

5+1=6 yuan.

Set the train speed to x kilometers per hour.

Then (x-4)*8 3600=

x=Let the speed of the second person be ykilometres per hour (y=

The second person has a speed of kilometers per hour.

Solution: Pedestrian speed: 4km h=4000 3600=10 9 m s Pedestrian and train speed difference:

90 8 = 45 4 ms Train speed: 10 9 + 45 4 = 445 36 Difference in speed between train and another pedestrian: 90 9 = 10m s Another pedestrian speed:

445/36-10=85/36m/s= km/h.

Hello.

Do it. The velocity of a is 4 km/h, which is converted into m s

v=4 Trains over A and B are both 90 meters.

The man walked 8 * (10 9) = 80 9 meters.

Then use the conductor of the train + this person to take the total distance of the train, and divide it by time to find the speed of the train.

Multiply the desired speed by 9Get the distance taken by the train xx-90 to get the distance taken by the person.

x-90) 9 to get the velocity of b. The unit is meters per second multiplied by how many kilometers per hour.

That's it.

Let the second person travel x kilometers per hour, and the train speed is y;

y-4）*8/3600 = 90/1000;y=kmh)(y-x)*9 3600=90 1000; x=kilometers hour) to the left by 3600 is the conversion of units of seconds to hours.

Dividing by 1000 on the right is the conversion of units of meters to kilometers.

Hehe, in fact, this is a physics problem.

90/8=a

90/9=b

v-v1=a

v-v2=b

Get v2 instantly.

Unit Conversion.

Train speed: 90 (A-4000 3600)=8 A=90 8+4000 3600

90 8 + 4000 3600-90 9) * 3600 = 40500 + 4000-36000 = 8500 m hours.

A: The second pedestrian is kilometers per hour.