Column equation solution application question 1 Answers to 13 questions

When students apply formula column headings, the overall feeling is that the formula columns are more difficult. In fact, the key equation problem is to determine the equivalence relation, find the equivalence relation, and you can list the equation here. So how do you find the relationship with the same quantity?

1) Sandwiched in the mathematical terms equivalence relations found in the relationship between the number of applied problems, **: the relationship between the general and the difference or multiple relations, often "total", "more". Less than.

Be. several times," and other terms. When solving a problem, you can use these terms to find equivalence relationships, according to the narrative sequence of equations, such as:

School tree planting activities, planting 50 fifth grade, fourth grade, planting in trees more than twice the number of small four, four how many grades of tree planting, "the question is the key word is" less. From here you can find such an equivalence relationship:? Twice the number of trees planted in grade 4 minus 4 equals the number of trees planted in grade 5, thus giving equation 2-4 = 50

2) Relationships found between quantities based on common equivalence relationships are common.

Number of Relationships: Efficiency Total Working Time = Work; ** Quantity = Total price; Speed Time = Distance. in solution.

When this question, you can go to the same number of relationships according to these relationships. For example: "The style of clothing, 36 yuan for a set, the current retail price of 216 yuan, can I buy clothes if I ask for the total number of sets?"

According to the quantity relationship of "unit price quantity = total price", you can list equation 36 = 216.

Crying is.

What about the topic? How can you do it without a question.

Hello! 787833240. Application of column equation solution, first: let the unknowns in the problem.

For example, the question asks: How many balloons are there?

You can set up a game: Solution: There are x balloons.

Then the equation is solved according to the equiquantitative relationship.

Second, it involves the solution journey.

If there are other unknown quantities in the whole question besides the distance, do not set the distance.

For example, the question asks: How long is the AB two-way?

Solution: Let the AB two roads have x kilometers. This is wrong. Because there are still unknown quantities in the whole question, such as unknown time and unknown speed. You're going to have to set up these two.

If all the conditions are there, you can set the route.

Original, don't copy! Original: Last, pure hand-hitting, plagiarism self-respect].

There are two pools are not filled with water, if the large pool is filled with water from the small pool, then the large pool is left with 20 tons, it is known that the volume of the large pool is the volume of the small pool, and how many tons of water are in the two pools.

The store buys a batch of shoes at a price of each pair of dollars, and when it sells to 5 pairs left, it earns 44 yuan in addition to the cost, how many pairs of shoes are there?

Let the number in the ten digit be x and the number in the single digit 3x+2

10（3x+2）+x+2]/3=10x+3x+231x+22=39x+6

x=22*3+2=8

The original two-digit number 28

1. Set x pieces of 1 corner and y pieces of 5 corners, then there is x+y=21

1x+5y=53

The solution is x=13

y=8 i.e.: 13 pieces of 1 corner, 8 pieces of 5 corners.

2. Set up x big monks and y small monks.

then there is x+y=100

3x+1/3*y=100

Solution x=25

y=75 i.e.: 25 big monks and 75 small monks.

Please refer to the above!

There are x coins with 1 jiao, and there are y coins with 5 jiao.

The system of equations is: x+y=21, x+5y=53 then: x=13, y=8

There are x big monks and y small monks.

The system of equations is: x+y=100, 3x+y3=100 then: x=25, y=75

1.Let 1 angle have x, and 5 angles have y, then.

x+y=21 (1)

x+5y=53 (2)

2)-(1) De.

4y=32 Therefore, y=8, substituting into (1) formula, gets.

x=13。2.Set up a big monk x person, a small monk y person, then.

x+y=100 （1）

3x+y/3=100 (2)

2) *3-(1), got.

8y=200, so y=25, substituting (1).

Get x=75.

3. A chair 2100 (6+1 8).

150 yuan. One table: 150 8 = 1200 yuan.

The purchase price of this product is x, and the 9% off price of this product: 33 yuan.

Then there is, and the solution gets x = yuan.