How to write 2 equations for a word problem, 2 questions for 2 questions and 4 questions for calcula

1. Let the original unit price of A be 2x yuan, then the unit price of B is 3x the value of 2000 yuan of the A raw material is 2000 2x = 3000 3x the value of 1000 yuan of the B raw material is 1000 3x

Then 9*[(3000 3x)+(1000 3x)]=(1000+2000)

Equations can be solved.

9*4000/3x=3000

9000x=36000

x=4, so the unit price of a raw material is 2*4=8 yuan.

Equation: 1 150x/x=25%

The title is wrong.

2. 16×10+20x=10+x

20x-x=10-16×10

19x=-150

x=-150/19

Since the ratio is 2:3, if each copy is x, the unit price of A is 2x, and the unit price of B is 3x

So (2000 2x+1000 3x)*9=2000+1000

The solution is x 4, so the unit price of A material is 8 yuan.

Because the ratio is 2:3, if each copy is x, then the unit price of A is 2x, and the unit price of B is 3x, so (2000 2x + 1000 3x) * 9 = 2000 + 1000 to get x 4

Therefore, the unit price of material A is 2 * 4 = 8 yuan.

Equation: 1 150x/x=25%

The title is wrong.

2. 16×10+20x=10+x

20x-x=10-160

19x=-150

x=-150/19

You can write the answer at the bottom of the question, and you will usually be asked to list the complete equation. Calculate the problem and write the result directly according to the requirements.

You can write these two application questions first, and then write these four calculation questions, because calculation problems are generally more troublesome than application questions, and the corresponding score is not as high as that of application questions.

A total of 523 teachers and students participated in the tree planting work, and if 70 people were divided into groups, then they could be divided into several groups at most.

Answer: 523 70=

Divide into up to 8 groups (7+1).

Divide 300 by 5 equals 60 to get how many meters per minute you walk, then divide 1200 by 60 to get 20 to get the ball from his house to school, 20 times 2 equals 40 to get the number of minutes to and from school back to the family dialect.

There is a barrel of oil, the first time I ate half of the barrel of oil is less than 1 kilogram, and the second time I eat the rest, it is generally 3 kilograms more. At this time, there were only 5 kilograms left in the barrel, how many kilograms of oil was there? It cannot be solved with equations.

What is left after the first time: (5+3)*2=16

The original Hengqing came to have: (16-1)*2=30 kg.

21 and 7 8 7

3 and 1 8

1) Then the area of the rectangle after the change = (a+3)(a-3)=a 2-9, the area of the rectangle after the change is reduced by 9 square centimeters compared with the area of the original square.

The original area was a square, and now a square is minus 9As a result, the area is reduced by 9 square centimeters. 2.No.

1. It turns out that there are x students in the art class.

It turned out that there were students in the calligraphy class.

x=30A: It turns out that there are 30 students in the art class.

2. The average cost per person is X yuan.

It costs 20x yuan in total.

x=A: Average RMB per person.

There were x students in the original art class.

3=x*（x=30

So it turned out that there were 30 students in the art class.

Yuan) each person has to pay Yuan.

There were x students in the original art class.

3+x= x=30(元.

(1) Solution: There are x cages.

The equation is 4x+1=5(x-1)-2

The solution is x=8, so there are 8 cages.

So there are 4x8+1=33 chickens.

2) There are x rooms on the first floor.

A group of inequalities is available.

4x＜485x＞48

3（x+5）＜48

4（x+5）＞48

Solve them in turn. x＜12

x＞48/5

x＞7x＜11

So 48 5 x 11

Because the number of rooms should be an integer.

So x=10

1. There are x cages, and the equivalent relationship is the number of chickens.

4x+1=5(x-1)-3

x=9;So there are 9 cages and 37 chickens.

2. If there are x rooms on the first floor of the hotel, there are: 1), the situation on the first floor: 5x>48>4x, 3 (x+5), 7< x<11 must be met at the same time, only x=10< p>

1.Insert a half. Indicates that there is still a half of the water that has not been in the water.

But three-quarters of a metre of water was in the other end. Explain that one-half of the bamboo pole has removed three-quarters of the wet meter, and five-sixths of the meter remains.

So three-quarters and five-sixths are one-half the length of the bamboo pole.

That's 19/12 of a meter.

Then the length of the main rod is 2 19/12 meters, which is 19/6 meters.

2 The maximum number of bags is required. And all three of these have the same number of bags, which is the greatest common divisor.

It is 40 bags. Each pack contains 8, 6 and 5 pieces.

3。Think of the last one as.

Then there are exactly 40 pluses.

Proportional application questions: Xiao Min does 3 questions.

It took 4 minutes, so how many minutes does it take to do 6 questions? Solution.

It takes x minutes to set up 6 questions. 3：

4=6:x solution x=8 Inverse proportional application problem: Xiao Ming does math problems, does 3 problems per minute, and completes them in 8 minutes, if he does 4 problems per minute, can he complete them in a few minutes?

Solution: It can be done in x minutes. 3 8=4 x solution x=6

1.Let B get x parts, then A is 6 5x parts, according to the title x 6 5x 330, solve x 150, 6 5x 180, conclusion: B gets 150 parts, A is 180 parts.

2.The average of the three numbers is 80, then the sum is 240, minus A is 40, then the sum of B and C is 200, let B be 7x, then C is 3x, according to the title 7x 3x 200, the solution is 7x 140, 3x 60, conclusion: B is 140, C is and 4 The inscription is too vague to see clearly.

5.From the question, it can be seen that 2 5 of the total land is used for planting 6Apples and nectarines, that is, 2 5 3000 1200cm, the same algorithm as the second question, get:

The apple species is 840cm, and the nectarine species is 360cm. 6.The profit is distributed according to the proportion of investment, that is, the profit distribution of A and B is 3:

5. As for how much money is divided, leave it to the subject to calculate it himself, and children should have economic consciousness from an early age