Primary 4 math problems, everyone helps

Set: A departs from A. When they meet for the first time, they travel a whole course, 700 meters in line A, and in the second meeting, they travel 3 times in total, and A should travel 700 3 = 2100 meters.

In fact, it took 1 whole journey and 400 meters. A full journey = 2100-400 = 1700 meters.

The person who swam out of Island A swam 700 meters, and the two met, indicating that the two swam exactly the distance of AB, and A had to swim two more 700 meters to meet for the second time.

The two encounters show that the two have swam a total of three ab distances, each of them swims a little more than one ab distance, and now the distance from b is 400 meters, minus 400,700 3-400 = 1700 (meters).

The second encounter shows that the total distance between the two people is 3 times the distance of AB, (you can draw a schematic diagram).

Among them, A game: 700 3 = 2100 (meters) is equivalent to the distance of one AB + 400 meters.

Therefore. distance of ab = 2100-400 = 1700 (meters).

1) Banana + Apple State = 150g

2) As can be seen in the picture, poplar trees = x trees, willow trees = 5x trees -80 trees.

370+80=5x, i.e. 5x = 450

2. （1）ach （2）dfg

3.As can be seen from the figure.

Daddy age = 40 years old.

My age = Daddy's age trail key 4

i.e. my age = 40 4 = 10 (years old) and mom age = my age + 25

i.e. mom age = 10 + 25 = 35 (years).

4.3 * A number - A number 2 = 2

1.(Brother Yubi 1) banana + apple = 150g (2) There is a picture to know, Yang Zhen tree = x trees, willow tree = 5x trees -80 trees 370 + 80 = 5x i.e. 5x = 450 2 （1）ach （2）dfg 3.

As can be seen from the figure, Daddy's age = 40 years old, my age = Daddy's age 4, i.e. my age = 40, 4 = 10 (years), Mom's age = My wit's age + 25, i.e. Mom's age = 10+25=35 (years) 43 * A number - A number 2 = 2

1.(1) Egg + banana = 100 + 50

2) 5 times that of poplar - willow = 80

2.It is being annihilated as soon as possible.

3.Dad's age = 4 times my age.

Mom's age - my age = 25

The number of Be's finches - half of the number of Jiajian = 2

1.(1) Egg + banana = 100 + 50

2) 5 times the size of the poplar - willow = 80

2.That's right. 3.Dad's age = 4 times my age.

Mom's age - my age = 25

4.3 times the number of A - Half of the number of A = 2

1 egg + 1 banana = (100 + 50) grams 5x-80 = 370ach dfg

Yaya's age 4 = Dad's age Yaya's age + 25 = Mom's age - Yaya's age = 25

A number 3 = A number 2 2

There were 24 people and later bought 72 bottles. 48 2=24 You can calculate that there are 24 people, and then suppose you buy x bottles of water 48+x 24=5 and you get 72 bottles.

24 people, later bought 72 bottles.

48 bottles 2 bottles People = 24 people.

5 bottles * 24 people = 120 bottles.

120-48 = 72 bottles.

After the wrong point, the extra money is moved to the right by one decimal place, that is, the original amount of money is expanded by 10 times. The extra money should be 9 times the original amount. So the original amount of money is yuan).

The yuan was recorded, so there was more yuan on the books.

The decimal point of the original money count has been moved to the right by one place, which means that the original amount of money has been expanded by a factor of 10. The extra money should be 9 times the original amount. So the original amount of money is yuan).

There is more money, and it is the decimal point wrong, it should be expanded, and the decimal point is wrong, so it should be expanded by 9 times, by the yuan.

So it should be a mistake.

You didn't tell us how much money we had after removing the excess.

If the question is correct, there are too many answers.

He wrote down the yuan as the yuan.

You now subtract the yuan, from the last digit is 2 to get z=8, and then from 4 to y=7, and so on, to get the yuan.

He mistook it for words. You see, don't you?

It's the record into.,That's why it's more.,I'm the accountant.,Roar.。。。

The yuan was recorded, so there was more yuan on the books.

When calculating, you can assume that it should be written as x, but after the result is incorrect, it is 10x-x = in the 10x column, and you can find x=

Hope it helps.

Equation solution.

The solution is x=, so the yuan is recorded as the yuan.

After the wrong point, there was more money, so it should be that the original decimal point of the money had to rely on another one, that is, the number of money was expanded by 10 times. The extra money should be 9 times the original amount. Yuan.

Set the width to x

, the side length of the largest square is x

So the length of the remaining part is 80-x. The width is x

So the perimeter = (80-x+x) multiplied by 2 = 160

Set the width to xdm

The circumference of the square is 4xdm

The remaining part is (80-x) dm long

So the remaining part of the perimeter is [2x+2(80-x)]dm, simplified to (160+x)dm

Let the width be x, and the maximum square side length is 80-x, and the formula is: 2 80+2x +2(80-x).

80x4

Let the side length of the square a be: (80-a+a)*2 =160 The answer is constant! There are no letters.

The Handsome Wolf Hunting team will answer for you:

Let the side length of the cut square be a, then the perimeter of the remaining concave hexagon is:

2×80+2a+2(80-a)

320, which is equal to the circumference of the original square.

Let the width of the rectangle be x decimeters, and the remaining perimeter is: 2*(80-x)+2x

Let the width of the rectangle be a, and the formula 2 (a+80)-3a

If the width is A, the side of the largest square is A, and the remaining circumference is 160dm (don't blame me).

B deposit: (240-40) (3-1) = 100 yuan.

A deposit: 100x3=300 yuan.

Solution, let B have a deposit of x yuan, and A has 3x yuan.

3x-240=x-40

3x-x=240-40

2x=200

x=100 B has a deposit of 100 yuan, A has a deposit of 300 yuan.

Let A be 3x and B x. Then 3x-240=x-40, and the solution is x=100, so A has 300 and B has 100

Solution: Set Zhang Ming to set off from school x hours, and the three of them met. Zhang Ming walked the same distance as Li Hua.

4 (x=Zhang Ming traveled a distance of 4 (km.)

Zhang Ming's speed is 10 kilometers per hour.

Clear thinking: The second encounter means that the two have completed the whole course three times, and the first time they meet the second meeting, the two have walked the whole course together for a total of 2 times.

Originally, it would take 5 2 hours, but if both people stayed for 1 hour, the time would be 5 2-1 hours;

However, because the slow train travels for an hour first, the total distance is missing, that is, 5 1 25 = 1 5 = hours.

Therefore, it takes 5 2-1-hours from the first encounter to the second encounter.