Find the 2nd grade Olympiad math problems

The second grade Olympiad workbook, "Inferences" is good!

Math Peiyou** Go and see Peiyou Intelligence. There is a practice machine!

1 There were 9 books just now, Dad bought him 5 more, Xiao Ming borrowed 2 books, how many books did he have just now?

2 Xiao Ming is 6 years old this year, Xiao Qiang is 4 years old this year, 2 years later, how old is Xiao Ming than Xiao Qiang?

3 The students lined up to do exercises, there were 4 people in front of Xiao Ming and 4 people in the back, how many people were in this team?

4 There is a book, Xiaohua read 2 pages on the first day, and every day after that, he read 2 more pages than the day before, how many pages did he read on the 4th day?

5 The students lined up to do exercises, counting from the front, Xiao Ming ranked 4th, counting from the back, Xiao Ming ranked 5th, this team has a total of them.

How many people? 6 There are 8 balls, if each boy gives one, there are 2 more, if the girl gives one each, there are 2 less, how many boys and how many girls?

7 The teacher gave each of the 9 good students a flower, and there was an extra red flower, how many red flowers did the teacher have?

8 If there are 5 students throwing sandbags, if the teacher gives each person 2 sandbags, it will be 1 shortage, how many sandbags does the teacher have?

Sprint 100 points", "New Classroom for Top Students", "Complete Explanation of Primary School Textbooks", "Complete Connection of Primary School Textbooks", "One Lesson and Three Exercises".

It is recommended that "Sprint 100 Points" and "New Classroom for Top Students", "Complete Explanation of Primary School Textbooks" and "Complete Connection of Primary School Textbooks" The combination of these two books has a good effect.

Search a whole bunch in the library.

Just go to the bookstore and buy it.

It's called drawing inferences.

Abstract Hello, allow me to write the answer oh wait a minute.

Grade 2 Mathematics Olympiad - Reasoning Questions: 20 =

Hello, allow me to write the answer oh, wait a minute.

Hello, the solution should be like this.

If your child doesn't know how to make equations, how can equal numbers be multiplied to equals four, so you can get 2

Hello, I hope to be able to meet your requirements, if there is anything wrong, you can re-tell me, I will answer patiently, and please give us a thumbs up.

1 Xiao Ming has 18 shells and Xiao Hong has 14 shells. Xiao Ming gives Xiao Hong a few more shells, and the number of shells for the two people will be the same?

2 Wang Jing has 24 Yuqiao wild flowers, after Wang Ning gave Wang Jing 8, the number of wild flowers between the two was equal, how many wild sedan flowers did Wang Ning have?

3 My sister has 50 yuan, and after giving my sister 10 yuan, the two of them have the same amount of money, how much money does my sister have?

4 Two piles of watermelons, after taking 6 from the first pile and putting them in the second pile, there are 5 more than the first pile, what is the difference between the original two piles of watermelons?

5 A bookshelf has two layers, if you take 10 books from the upper layer and put them on the lower layer of the vertical sail key, the upper layer will have 15 more books than the lower layer, and the upper layer will have more books than the lower layer?

6 There are 28 watermelons in two baskets A and B, take 3 from basket A and put them into basket B, and the number of watermelons in the two baskets is the same. How many watermelons are in basket B?

7 If a student is transferred from Class A to Class B, the number of students in Class A and Class B is the same. If a student is transferred from class B to class C, there will be 2 more students in class C than class B. Which class has more people compared to class A and class C? How many more?

8 Xiao Jun and Xiao Hao originally used the same amount of money to buy the same number of pencils of the same kind, but later Xiao Jun took 13 pencils, Xiao Hao took 7, and Xiao Jun gave Xiao Hao 3 dimes. Q: How much is each pencil?

One. Fill in the blank:

4.What numbers do they represent?

2. Application Questions:

1.There are 35 pieces of candy, in the order of naughty - laughing - Ding Ding - Dongdong, each person will send one at a time, think about it, who will get the last one?

2.Naughty has 300 yuan, 56 yuan to buy books, 128 yuan to buy stationery, how much less money is left for naughty than the original?

3.How many minutes does it take for 5 cats to eat 5 mice and 20 cats to eat 20 mice?

4.Thirty students signed up for the art group. Among them, 26 people participated in the art group and 17 people participated in the calligraphy group. Q: How many people are there in both groups?

Observe the first few terms of the column, find out the pattern, and write the 100th term of the series?

If you only add and subtract without a solution, then there are only 8 ways to fill in the three spaces:

It is impossible to substitute all these eight types, so there is no solution.

If you only add and subtract, then there are only 8 ways to fill in:

It is impossible to substitute all these eight types, so there is no solution.

There is no solution, the problem is wrong, and it may be possible to add multiplication and division.

Tell you clearly that with just addition and subtraction, the result can only be a multiple of 3. Plus multiplication and division might work.

The second grade has already learned multiplication and division, oh, it should be able to fill in. It's impossible to just add and subtract.

There's no answer to that question.

Something went wrong.

Since there are three parentheses, it means that there are the following situations:

None of them are possible, so this question is wrong.

3 pcs: 14+16=30

1 1 : 30 3=10

v=Landlord, you choose me. Pure hand-hit v.

Actually, this question is very simple. Just think about it.

Use + =16 , =14 left minus left, right side minus right side to get - =2 so = +2 into the first equation to get.

2+ +2+ =16 then =4 =6

You can multiply the previous equation by 2, then the left side of the equation becomes 4 squares plus two triangles, and the right side becomes 32Comparing with the second equation, three more squares are equal to 18Then =6, =4

Because: +=16, +=14 so the difference between and is 16-14=2, and 16+2 = 3, which is equal to 6, = -2=4

□=,6，△=4

Start with 16-14=2, which is - =2

Then set to x, then to x+2

x+2+x+2+x=16

3x=12x=4□ =6

A square is equal to 6, and a triangle is equal to 4.

On the way, the truck was repaired for 2 hours due to a breakdown, which is equivalent to 2 hours for the passenger car to go first, and 1/10 2 5/5 of the journey

The meeting time of the passenger car and the van is.

1 1/5) (1/8 1/10) 32/9 (hour) When they met, the truck traveled the whole way.

1/8 32/9 4/9

The bus traveled the whole way.

1 4/9 5/9

A and B are far apart.

40 (5/9 4/9) 360 (km).

Let the distance between the two cities of A and B be x, then the speed of the truck is x 8, the speed of the passenger car is x 10, and the time of the passenger car when they meet is y, then.

x 10)*y+(x 8)*(y-2)=x(x 10)*y-(x 8)*(y-2)=40 According to the equation, it can be solved: x=360 (km).

(1 + 1 8 *2) 1 8 + 1 10) = 50 9 (hour).

40 1 8 * 50 9 - 1 10 * 50 9) = 288 (km).

A: The distance between the two cities is 288 kilometers.

Let the distance be x truck speed x 8 bus speed x 10 and the total speed is 9x 40

The passenger car travels 2 hours longer than the truck, i.e. x 5 travels the distance of the remaining 4x 5 together The distance of the truck is x 8*32 9=4x 9 The passenger car travels 40 km longer than the truck when they meet x 9=40 x=360

(8 + 10) is the time for the two cars to go once, that is, round trip, if you want to go 2, you can get 9 hours, the truck walked 2 hours less than the bus (there is no time to move forward when the car is repaired halfway), the bus has gone 40 kilometers more than the truck, 9 2 hours in 18, the distance = 40 9 = 360 (km).

Solution: Under normal circumstances, the time of meeting is 1 (1 8 + 1 10) = 40 9 (hours), the meeting time after the truck is delayed for 2 hours: (1-2 10) (1 8 + 1 10) = (4 5) (9 40) = 32 9 (hours), the distance traveled by the truck when meeting (32 9) * (1 8) = 4 9, the distance taken by the bus (32 9) * (1 10) + 2 10 = 5 9, the bus travels 40 kilometers more than the truck, so: 40 (5 9-4 9) = 360 (km).

If it is inappropriate, please advise.

8+2=10, this is the time for the truck to arrive in city B.

2 hours by bus for 40 km.

The bus travels 20 kilometers in 1 hour.

The last 20 * 10 = 200 km.

Please forgive the little brother for not being talented, I can't answer it with elementary school knowledge....

1. 20-10-4 6 (bai

6 2 du3 (pcs).

Answer: zhi jia basket to B basket dao 3.

2, 4 2 2 2 (pieces) 20-2 18 (pieces) Answer: After Xiaohong gave her 2.

She boasted of 18 of them.

2 8 (pcs).

Sister: (40-8) 2 16 (sheets).

Brother: 40-16 24 (sheets).

A: My sister has 16 and my brother has 24.

2 8 (Ben).

Bottom: (28-8) 2 10 (Ben).

Above: 28-10 18 (Ben).

A: There are 10 on the lower floor and 18 on the upper floor.

5. (10+4)*2 28 (only).

A: There are 28 of them.

14 (times) 14 2 7 (times).

Answer: Take the same amount after 7 times.

12 (times) Answer: Take 12 times after the same amount.

5*2 10 (pcs).

20*2-10 30 (pcs).

A: There were 30 apples in basket B.

One type, I'll give you a method, use the method of drawing line segments, one A, one B, compare the difference, this is the most straightforward.

1.(20-10-4) 2=3 (pcs).

3(40-2*4) 2=16 (sheets).

4.(28-4*2) 2=10 (book).

5.(10+4)*2=28 (only.)

Inside) 6.(68-40) 2 2=7 (times.)

Capacity) 7.(48-12) 2 3 = 6 (times)).

1.（20-10-4）

2=3 (pcs).

Inner 2 (pcs) 20-2 18 (pcs).

Sister: (40-8) 2 16 (sheets).

Brother: 40-16 24 (sheets).

Ben) tolerate: (28-8) 2 10 (Ben).

Above: 28-10 18 (Ben).

5.(10+4)*2=28 (only.)

14 (times) 14 2 7 (times).

12 (times) 20*2-10 30 (pieces).

Piece.

pcs, 18 pcs.

3. There are 16 sheets.

Root. A little white rabbit. Times. Times.

Piece.

All of them.

Only one after another.

Solution The ratio of Xiaoqiang to Xiaogang is: (1-1 10): 1=9 10 The ratio of Xiaogang to Xiaolin is: (1-1 10): 1=9 10=10 10*10 9=10 (100 9).

So the ratio of the speed of the three:

Let Xiaoqiang's velocity be x, Xiaogang's y, and Xiaolin's z

y=11/10x

z=11/10y

x:y:z=x:11/10x:11*11/100x=1:11/10:121/100