Solving equations practical problems and solving equations .

Move items and merge:

then x=; Move items and merge:

4-3/2)x=(-1+1-1/5);

Then x=(-1 5) (5 2)=-2 25 suppose there are a total of x students.

9x-5=8x+2

x=7 means that there are a total of 7 students, and the value of two table tennis boards is: 9*7-5=58 yuan.

1.x=

3/2x-5/4x=1

1/4x=1

x=1/43.If two table tennis rackets are worth x, the class size is (x+5) 9(x+5) 9 - 1]*8+(8+2)=x8x 9-32 9+10=x

x/9=58/9

x=58

.7x+

2=xx=2

2. There is a problem with the second question.

3. Set up two table tennis rackets worth y yuan There are x people in the first class of junior high school.

9x-5=y

8x+2=y gives y=58 x=7

1, x 22, not very clear title.

3. Let the money be y, the person is x, 9x-5=y

8x+2=y

solution, y=58

Because. I can't put it on all of them.

If the first type of mold is installed to eliminate x tons, then the second type is installed to 460 x tons.

x 160 tons.

Therefore, the first type is loaded with 160 tons, and the second type is loaded with 300 tons.

450 tons).

350 cubic meters).

So, you can't all load them on board.

Set up a type of cargo to cover the morning loading x tons, type B cargo to load 460-x tons.

Solution: x=160

460-x=300

Answer: The wild and wide should be 160 tons of A cargo, and 300 tons of B cargo.

Set: B departs to meet for x minutes.

Solution: 40(x-5)+60x=1000 40x-200+60x=1000 100x=1200 x=12 minutes.

Check: 40 (12-5)+60 12=40 7+720=280+720=1000.

Solution: Let B take x minutes from departure to meeting.

60x+40（x-5）=1000

60x+40x-200=1000

100x=1200

x=12

1. All of them were originally planned to erect x meters of wires every day.

4000 x (1 + 1 3) + 2 = 4000 x solution yields: x = 500

The number of students in the whole school is 140k = > the number of students in Class 61 = 7k; 18 girls = 3k ; Boys: 4k = > k = 6

840 people. ans

There are x people in the whole school.

18*seven-thirds*20

First of all, you can find the number of people in class 61, and set the number of people in class 61 x, then 18 x=3 7 find x=42

In the same way, if there are y people in the whole school, then 42 y=1 20 is found to be y =840, that is, there are 840 people in the whole school.

Thank you, the first floor seems to have done something wrong, giggles.

2x=x=

As you can see from the conditions of the question, when taking a box, the surface area is actually reduced by the side area of a box!

And the side area is equal to the circumference of the base multiplied by the height!

Bottom circumference: cm.

So height: 314 cm.

So the volume of each box: 10 x 10 x 5=1570 cubic centimeters.

8*Eight and a half.

x = reduced surface area is actually the area around the box by 1 circle, equal to the circumference of the bottom multiplied by the height of the box.

So height = 5cm, volume = cubic centimeters.

1.-x=-2/5 x+1

5x=-2x+5

3x=5x=-5/3

One-third = - one-third x+2

6x-1=-x+6

7x=7x=5x=5

x=14.-7x+2=2x-4

9x=-6x=2/3

An airline stipulates that a passenger in the ordinary class of an airplane can check in up to 20kg of baggage free of charge, and each kilogram of the excess can be purchased according to the air fare. A passenger checked in 35kg of luggage, and the ticket and baggage fee were paid for a total of 1,323 yuan.

Find the passenger's ticket fare.

Suppose the passenger's ticket price is $x.

x+x*x(1+

x=1323 yuan.

When describing, it's best to write the equation clearly, otherwise you may make mistakes:

Solution 1, -x=-2x 5+1, -x+2x 5=1, 3x 5=1, x=5 3 (if you write (2x+1) 5, then first multiply both sides of the equation by 5 to remove the denominator, and so on).

Solution x-1 3=-x 3+2,2x+x 3=2+1 3,7x 3=7 3,x=1 (same as above).

Solution x-2=3-x,4x+x=3+2,5x=5,x=1

Solution 4, -7x+2=2x-4, -7x-2x=-4-2, -9x=-6, x=2 3

Solution ((35-20)*yuan (you can also set the ticket** as xyuan, and then use the one-yuan one-dimensional equation to solve).

According to the title, 1323-(35-20)*x* shift, 1323=x+(35-20)*x*merge similar terms, 1323=

Divide both sides of the equation at the same time to get x=1080

If a factory holds a banquet on the weekend, if the beauty uses a rice bowl, every two people use silver to guess a vegetable bowl, every three people share a soup bowl, supply and demand 165 bowls, calculate, how many people participate?

x)x+1/2*x+1/3*x=165

11/6*x=165

x=902, there are 31 workers in workshop A, 20 people in workshop B, and now 18 people are transferred to support, so that the number of people in workshop B is half of the number of people in workshop A, how many people should be transferred to workshop A and B?

Solution: Set up x people who are transferred to A.

31+x=(20+18-x)*2

31+x=76-2x

3x=45x=15

3. 30 tons of grain in warehouse A, 40 tons of grain in warehouse B, and 80 tons of grain are now transported to warehouse A and B, so that the grain stored in warehouse A is multiple of the grain stored in warehouse B. How many tons should be transported to warehouse A and B?

Jie: Set x tons to be shipped to A.

30+x=(40+80-x)*

30+x=x=60B: 80-60=20dun

To solve the ** of each household to pay X yuan, according to the topic:

23x-18x=9000

Solution x = 1800 yuan.

Answer: Each household needs to pay 1800 yuan.

Solution: Set up X parts installed last year**.

23-18)x=9000

5x=9000

x=1800

Answer: Each household needs to pay 1800 yuan.

To dissolve the setup, you have to pay $x.

23-18)x=9000

5x=9000

x=1800

That is: 1800 yuan per household to install **.

Set each household to install ** will be x yuan. then 23x-18x 9000, x 1800 yuan.