Primary Mathematics 5th Grade Application Problems, Equation Solving, Forbidden Arithmetic.

First, set up a daughter [x years ago]. Then the equation is.

56-x=3(26-x)

x = 11 (years).

Therefore, the father's age at that time was: 56-x=56-11=45 (years) The daughter's age was: 26-x=26-11=15 (years) two, let the original ten-digit number be x, then the single digit number is 2x, and the two-digit number is:

10x+2x, the two digits after the exchange of digits are: 20x+x, and the column equation is:

20x+x=(10x+2x)+27

The original number of x=3 is: 10x+2x=10*3+2*3=36 three, let the width be x cm, then the length is 2x-4 cm, and the column equation: 2 (x + 2x-4) = 28, x = 6 (cm).

The area is x(2x-4)=6*(2*6-4)=48 (square centimeters).

1 After X years, the father is three times older than the daughter.

56+x=3*（26+x）

Solution x=11

So after 11 years, the daughter's age is 11 + 26 = 37

2 Let the number on the ten digit be x, then the number on the single digit is 2x, the original two-digit number can be expressed as: 10x+2x, and the exchanged two-digit number can be expressed as: 2x*10+x, so the equation is:

10x+2x+27=2x*10+x, the solution is x=3, so the original two-digit number is 36

3 Let the width be x, then the length is 2x-4, and the equation can be obtained by double the length plus 2 times the width = perimeter.

2x+2*（2x-4）=28

The solution is x=6, the width is 6, and the length is 8, so the area is 6*8=48

1。Set a daughter to be x years old.

3x=56+(x-26) x=15

2.Set 10 digits x and single digit 2x

2x*10+x=10x+2x+27 x=3 The number is 363. Set width xx + (2 x - 4) = 28 2 x = 6 length 2 * 6 - 4 = 8 area 6 * 8 = 48

The first question (56+x) is divided by (26+x)=3 and the solution is x=11, so when the daughter is 26-11=15 years old, the father is 3 times as old.

Question 2 This problem is a binary linear equation (10x+y) + 27=10y+x to get x=6 y=3, and this number is 63

x=2y Question 3 If the circumference is 28, then the width of the long family = 14 x+2x-4=14 x=6 2x-4=8 the length is 8 and the width is 6

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1 Solution: Suppose that when a daughter is x years old, her father is 3 times that of her.

Because over time, when a daughter grows up, so does her father. So their difference remains the same. ）3x-x=56-26

2x=30x=15 A.

2 Solve that the ten digits of the original number are x

According to the later result of "27 larger than the original number" - original number = 27) 2 * 10x + x) - 10x + 2x) = 27

20x+x-10x-2x=27

20+1-10-2)x=27

x=27/9

x=33*10+3*2=36 Answer: The original number is 363The solution width is x

2*（2x-4+x）=28

2x-4+x=28/2

3x-4=14

3x=14+4

x=18/3

x=6 length: (4 cm shorter than 2 times the width) 2*6-4=8 area: 6*8=48 square centimeters. Answer.

When the daughter is 15 years old, her father is three times as old. 3（26-x）=56-x

Solution: Let the width of the rectangle be x meters and the length be (meters.

x+5x=100

x=20A: The width of the rectangle is 20 meters.

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Solution: Set the width to be x meters.

5x＝100

x＝100÷5

x＝20

Solution: Let the width of the rectangle be x

x+x=A: The width of the rectangle is meters.

If the width of the rectangle is x meters, the length is meters.

1+x=20 (m).

A: The width of the rectangle is 20 meters.

The solution width is x

2(x=20 Answer: The width of a large rectangle is 20 meters.

Solution: Let the width of the rectangle be x meters, then the length of the rectangle is meters.

x + multiplied by 2 = 100

Multiply by 2 = 100

5x=100

x = 100 divided by 5

x=20 Because my level is not high, the above will be multiplied and divided into Chinese characters).

Solution: Set the width to x meters.

x=20Answer: The width of the rectangle is 20 meters.

Solution: Set the width to x meters.

2(x+2*5x=100

x = 20 A: The width is 20 meters.

good luck!Good luck!

Set the width to x (x+

5x=100

x=20A: The width of the rectangle is 20m

Solution: Set the width to be x meters.

2*x=50

x=20A: The width is 20 meters.

Solution: Let the width of the rectangle be x

2(x+2(x+

x+ =50

x=20

Solution: Let the width of the rectangle be x, then the length is.

2*（x=20

Solution: Set the width to x.

x+x+x+

x+x=A: The width of the rectangle is meters.

Solution: Let the rectangle be width x meters.

2（x+2x+3x=100

x=20

The width of the rectangle is x meters and the length is meters.

2*（x+x+ =50

x=20

1. There are a total of x people in the family.

4x+24 =6x -4

2x = 28

x = 14

2. The fifth grade students rented some boats for boating activities. If there are 4 people per boat, there are 5 more people, and if there are 5 people per boat, there are 4 empty seats. Q: How many boats are rented?

X boats were rented.

4x +5 =5x - 4

x = 9

Assuming there are x people, the number of pears is certain.

The available equation 4x+24=6x-4 2x=28 x=14 assumes x boats.

5x+5=6x-4 x=9

If there are 5 people per boat, there are 5 more people, and if there are 5 people per boat, there are 4 empty seats. It's all five people sitting here, and the question is wrong. I'm counting it as six seats per boat, and there are four empty seats.

1.Solution: There are a total of x people in the family.

4x+24=6x-4

x=142.Solution: Rented x boats.

5x+5=6x-4x=9

1. Solution: There are a total of x people in the family, and the equation is obtained.

4x+24=6x-4

6x-4x=24+4

2x=28x=14

A: There are 14 people in the family.

2. I can't do it.

There are a total of 14 people in the family, and the second question is wrong, so please write the question clearly.

The first equation is 4x+24=6x-4

The solution is x=19

You mistyped the second question.

It's all 5 people.

14 people.

The second question is wrong.

14 There is a problem with the second question.

Solution: Let B walk x meters per minute.

860-300=560（m）

37+x）x7=560

37+x=560÷7

37+x=80

x=80-37

x=43A: B walks 43 meters per minute.

Hello: Solution: Let B walk x meters per minute.

37＋x）×7＝860－300

37＋x＝560÷7

x＝80－37

x＝43

Solution: Let B walk x meters per minute.

37＋x）×7＝860－300

37＋x＝560÷7

x＝80－37

x=43A: B walks 43 meters per minute.

Solution: Let B walk x meters per minute.

37x7+7x+300=860

259+7x+300=860

259+7x+300-259-300=860-259-3007x=301

7x÷7=301÷7

x=43

A walked a total of 7 minutes * 37 meters minutes = 259 meters.

Then B is gone: 860 meters - 300 meters - 259 meters = 301 meters.

So: B walks per minute: 301 meters 7 minutes = 43 meters per minute.

Solution: Let B walk x meters per minute.

37*7+7x+300＝860

x=43A: B walks 43 meters per minute.

Let B walk x meters per minute.

37 times 7) plus 300 plus 7x] = 860

Get x=43

Solution: Let B walk x meters per minute.

7 (x+37) = 860-300 Equiquantitative relation: time * speed of two people = distance between two people (i.e., the distance traveled by two people).

7x+259=560

7x=301

x=43

860 300 560 m.

7 37 259 m.

560 259 301 meters.

301 7 43 meters.

So B walks 43 meters per minute.

Let B walk x meters per minute.

7x+7x37=860-300

Solution: 7x+259=560

7x=560-259

7x=301

x=301/7

x=43A: B walks 43 meters per minute.

Solution: Let B walk x meters per minute.

then (37 x) 7 860 300

x=43A: B walks 43 meters per minute.

Let B walk x meters per minute.

300 + 37 7 + 7 Ex = 860

When Xiaoli calculated and divided by a number, she wrote it as, and the result was more than the correct quotient, what should be the correct quotient for this question?

Hello! I just did the math of these questions. It should be guaranteed to be correct.

1) 18 (hours).

1500 (18+12)=50 (pcs) ......1500 12 = 125 (pcs) ...... processed per hour before the improvement of the technologyA: 50 per hour before the improved technology, 125 per hour after the improved technology.

2) Each person ate 10 4=loaves of bread.

The money given by Ding is equivalent to the money of a loaf of bread.

So each loaf of bread dollars.

A paid for six loaves of bread and ate one for himself.

So A should take back the yuan.

This is one of the algorithms, and there are others. But I think it's better to understand.

1。After improving the technology, the same time, can be processed more:

1500 (pcs.)

Processing per hour: 2250 18 = 125 pcs.

Before the technology was improved, processing per hour: 125 pcs.

2.Average eating per person: 10 4=pcs.

Per loaf: yuan.

A paid more: a money.

A should be recovered: yuan.

1. Assuming that after the improvement, the working time is still the same time as the original, 1500* parts can be produced, so that 3750-1500 2250 parts are produced more than 1500, so many parts are produced in 18 hours, so 2250 per hour is processed divided by 18 125, which is now, the original is 125 divided by one. Inspection: It used to take 30 hours, but now it takes 12 hours.

Four people eat bread, each person eats one, Ding should pay the yuan is the money of the bread, the unit price of the bread: divided by the yuan, A should take back the money of the bread, that is, the yuan.

(3750-1500) 18=125.

125 pcs.

A: 125 per hour before the improved technology, 50 per hour after the improvement.

Answer: A should be ** yuan.

1500-600=900

900 18 = 50 (previous).

50*).

should be recovered).

Article 2: Because the money is divided equally, 10 loaves of bread is yuan, and because 6 yuan bought 10 loaves of bread, so each yuan, and A paid 6 yuan, that is, yuan, and each person should pay yuan, so A can take back: yuan.

1.Solution: Let there be x large boats and 10-x small boats.

6x+4(10-x)=53+1

6x+40-4x=54

2x=14x=710-x=10-7=3

A: There are 7 for the big boat and 3 for the small boat.

2.Solution: Let Xiao Ming answer x questions correctly and answer 30-x questions incorrectly.

4x-2(30-x)=0

4x-60+2x=0

6x=60x=10

30-x=30-10=20

Answer: 10 questions were answered correctly and 20 questions were answered incorrectly.

3.Solution: Let there be x adults and 50-x children.

4x+(50-x)/4=50

Multiply by 4 at the same time to get:

16x+(50-x)=200

16x+50-x=200

15x=150

x=1050-x=50-10=40

A: There are 10 adults and 40 children.

1.There are x large boats.

6x+4(10-x)=53+1

x=7,10-x=3

7 large boats and 3 small boats.

2.If the answer is correct, the answer is incorrect (30-x).

4x-2(30-x)=0

x=10,30-x=20

10 correct answers and 20 incorrect answers.

3.There are x adults and 50-x children.

4x+1/4(50-x)=50

x=10,50-x=40

There are 10 adults and 40 children.