3 primary math application problems equation solving .

How did you do it with the equation today!

1. Set: The second workshop produces x parts per hour.

4x = 25×4+160 x=60

2. Set: The speed of the car is x kilometers per hour.

50×（2+ x=70

3. Set: The speed of the bicycle is x kilometers.

x+x+ x=13 13+km).

1.The second workshop produces x parts per hour.

4x=160+25*4

x=652., the speed of the car is x

3.Car speed x bicycle speed.

x*3+3(

1. Set up a second workshop to produce x parts per hour.

4*x=4*25+160

x = 65.

2. Set the speed of the car x, then.

x = 180 km, and large trucks cannot reach city B. kilometers.

3. Set the bicycle speed x, then.

3*x+3*（x+

x=13 then the speed of the car is 13+ kilometers per hour.

1. 160 25 = 25 * 260 4 = 65 2, 400

3. Let the speed of the bicycle be x kilometers per hour, x + 3 + x * 3 =

x = 13 km-h.

The speed of the car is kilometers per hour.

1. Set: The second workshop produces x parts per hour.

4x = 25×4+160 x=60

2. Set: The speed of the car is x kilometers per hour.

50×（2+ x=70

3. Set: The speed of the bicycle is x kilometers.

x+x+ x=13 13+km) (calculate it later).

Xiao Dong, Xiao Ming, Xiao Hua and the school are on the same side of a straight road. Xiaodongjia is 1 km away from the school, the distance between Xiaoming's house and the school is 110% of Xiaodong's distance from the school, and the distance between Xiaohua's house and the school is twice that of Xiaodong's distance from the school.

Solution: Xiao Ming: 1+110%=

Xiaohua: 1 The first case: Xiaodong and Xiaoming are both on the same side of the school.

Then the distance between Xiaodong and Xiaoming's house =

The second case: Xiaodong Xiaoming is on both sides of the school.

Then the distance between Xiaodong and Xiaoming's house = 1+

Make a trapezoidal frame with iron wire, the two bottom corners of the frame are equal, if the upper bottom is required to be ten meters long, the lower bottom is twice as long as the upper bottom, and a waist is 13 meters long, how many meters of iron wire is needed for this frame?

Solution: The upper bottom: 10 Then the bottom is 10*2=20 Two waists: 13*2=26

10 + 20 + 26 = 56 meters.

A: This frame requires at least 56 meters of wire.

What is the volume of a steel pipe with an inner circle diameter of 60 centimeters, an outer circle diameter of 80 centimeters, and a length of 6 meters?

Solution: v= (r -r)*l

1318800cm³

The sales volume of a cigarette factory in the first half of the year is 30 million yuan, if the consumption tax is paid according to the sales volume of 45, how many yuan should be paid in the first half of the year?

Solution: 3000*45%=1350 (10,000 yuan).

There are a number of children, each of whom gets 3 apples, and there are 2 left, a total of 17 apples, how many children are there?

Solution: There are x children, then.

3x+2=17

The solution is x=5

A: There are 5 children.

1.Solution: 2x+x=180

x=602.Solution: 3x-21=

x=3.Solution: Set a fountain pen x yuan.

13x=291-187x=8

1.Solution: x+2x=180

3x=180

x=60, then 2x=2*60=120

A: There are 60 male teachers and 120 female teachers in Qiming Primary School.

2.Solution: The second question is not copied incorrectly, and there is no solution.

3.Solution 90*

135+52+13x=291

187+13x=291

13x=291-187

13x= 104

x=8A: The unit price of each fountain pen is 8 yuan.

Such a simple question, you ask, you're crazy, the mouth has the last one, is it a multiplier sign, or x, it should be a multiplier sign, x=3.Fountain pen = 8 yuan.

1. 2x+x=180

x = 60 males 60 females 120

2. 3x-21=

x = 3 set a fountain pen x yuan.

13x=291-187

x = 8 yuan for a fountain pen.

1. There are x male teachers and 2x female teachers.

x+2x=180

x=60 2x=120

x(x-7)=

3x(x-7)/3=

x-7=x-7+7=

x
*x=8

3x=180

x=602.Superclass.

3.Let x be the equation according to the problem: 90*

13x=104x=8

3x=180

x=180/3

x=602x60=120 (person).

2.Solution: 3x-21=

3x=3x=

x=x=135+52+13x=291

13x=291-135-52

13x=104

x=104/13

x = 8 A: 8 yuan per pen.

Hehe, take a closer look at the answer below.

1.There are 180 teachers in Qiming Primary School, of which the number of female teachers is twice as high as that of male teachers.

Setting: x number of male teachers and 2x number of female teachers.

Solution: 2x+x=180

2+1)x=180 (we can assume x as "1") 3x=180

x=180÷3

x=6060 2=120 (person).

A: There are 60 male teachers and 120 female teachers.

2.Solve the equation: 3x(x-7)=

x-7）=x-7）=

x=x=3.Tongle School bought three items, 90 boxes of chalk, and the unit price is. 13 boxes of ink, the unit price is. I bought 13 pens, but I don't know what the unit price is, the total price is 291 yuan. Ask to calculate the unit price of each pen.

Set: X yuan per pen.

Solution: 90 135 + 52 + 13x = 291

187+13x=291

13x=291-187

13x=104

x=104÷13

x=8A: 8 yuan per pen.

Hee-hee, I've listed the steps in detail for each question.,It's the second question.,I don't know if the X after 3 is the letter X or the multiplication sign.。 If it's wrong, please ask me to correct it! ~

1.A primary school three. Four.

A total of 585 trees were planted in the fifth grade, the number of trees in the fourth grade was 1 5 in the fifth grade, and the number of trees planted in the third grade was 3 4 in the fifth grade. 2.In a certain year, the rainy days in July are 8 11 less than the sunny days, and the number of cloudy days is 3 22 sunny days, how many rainy days are there in this month?

3.There are a total of 152 students in the fifth grade of a school, and 1 11 boys and 5 girls are selected to participate in the math competition, and the rest of the students are exactly equal. 4.

There are two iron wires 44 meters long, if the first one is cut off 1 5, and the second one is connected to the meter, then the two are equal, how many meters are the original length of each of the two?

A: 3 4 * 300 = 225 trees in the third grade, 300 * 1 5 = 60 trees in the fourth grade, and 300 trees in the fifth grade.

2 If someone rides a bicycle from home to the train station, if they travel 15 kilometers per hour, then they can arrive 15 minutes before the train starts, if they travel 9 kilometers per hour, they will arrive 15 minutes later than the driving time, and now they plan to arrive 10 minutes earlier than the driving time, how many kilometers per hour should they travel?

Answer: The distance between the two places is: 15*[1-15 60]=km.

Then arrive 10 minutes early, an hour should be done:. 5 km.

3 canteens buy flour and rice, the weight of flour is twice that of rice, eat 15 kilograms of rice and 20 kilograms of flour every day, a few days later the rice is all eaten, there are 80 kilograms of flour left, how many kilograms of rice and flour are bought in this canteen?

Solution: Let rice be x kilograms, then flour is 2 x kilograms, then the time is x 15 days, so there is 20 * (x 15) + 80 = 2x, and the solution is x = 120So 120 kg of rice and 240 kg of flour.

The following is a little easier.

1: Car A travels for 10 hours, vehicle B travels for 7 hours, and car A travels 276 kilometers more than car B. If the speed of the two trains is the same, find the speed of the two trains. (party).

2: Chen and Zhang ride bicycles from the same spot in opposite directions at the same time. Kilometers away after hours. Chen travels 12 kilometers per hour, how many kilometers does Zhang travel per hour? (party).

3: The number of bookcases sold by the furniture factory is one-fifth of the five x cabinets, and the bookcases sold are 120 less than the five x cabinets. (party).

4: To make a rectangular tin box with 60 square decimeters, the length of the bottom is 4 decimeters, the width is 3 decimeters, and what is the height? (party).

5: The master processes 80 parts, which is 10 less than the 2 companions processed by the apprentice. How many apprentices process? (party).

6: The apprentice processes 45 parts, which is 5 more than half of the master's. How many are processed by the master? (party).

Answer: 1A x B y

10x-7y=267

10/x+7/y=1

2.sheets x 12+x)*

3.Bookcase x five x cabinet y

x = one-fifth * y

x=y-120

4.Height x 4 * 3 * x = 60

5.Apprentice x2x-10=80

6.Master x one-half * x + 5 = 45

If a car travels from A to B 300 kilometers away at an average speed of 40 kilometers per hour for the first 120 kilometers, what speed should the car travel at for the rest of the journey?

300 50 = 6 (hours).

120 40 = 3 (hours).

Solution: Let the rest of the distance travel x kilometers per hour.

120＋（6－3）x=300

120＋3x=300

3x=180

x=60A: The rest of the journey is 60 kilometers per hour.

1.Xiaoyu walked 1 2-1 3 = 1 6

Then Kim walked 1 6 (6 5) = 5 36

1 2-5 36 = 13 36 from the midpoint

2.Set up a large basket with x

5x/6/(130-x+x/6)=7/6

x = 84 small basket with 46 kg.

3.Let the total be x

2x 5+2x 5+4) (x-2x 5-2x 5-4) = 5x = 120 pages.

120 2*120 5-2*120 5-4=20 pages.

This kind of problem should pay attention to the correspondence between the quantity and the fraction, and the unit can be obtained by division.

1.It is considered that the distance of Xiaoyuxing is 1 3 and the speed is 6, so the time is 1 3 61 18, and multiplied by the speed of Xiaojin 5 is the distance 5 18

2.According to the second condition, their ratio is 7:6, and the total score is 13, then, 130 7 13 = 70 is the weight of the large box later.

70 is then removed, and its fraction is 1-1 6, that is, 70 (5, 6) = 84, which is the original weight of the large frame. 130-84=46 is the weight of the box.

3.First of all, according to the ratio of the number of pages read to the number of pages left at this time is 5:1, we can know that the number of pages that have been read accounts for 5 6

Those who have seen it account for 5 6, and they have seen 2 5 on the first day, then we can find out that the second day we have seen 5 6-5 5 = 13 30Immediately, according to "the second day read 4 more pages than the first day", the score of reading more on the second day than on the first day is 13 30-2 5=1 30Finally, 4 1 30 = 120 is the whole book.

120 1 6=20 is the number of pages not read.

1.Xiaoyu is 1 3 from the midpoint

Explain that he just walked 1 2 of 2 of 2

So he just left.

The total distance. 1 2 times 2 3 equals 1 3

So Kim is gone.

Walking. 1 3 times 5 6 equals 5 18

So the little gold is still from the midpoint.

1 2 minus 5 18 equals 2 9

1. Solution: Let the gold be far from the midpoint and x

6：5=x：1/3

The solution is x=2 5

That is, Xiaojin is still 2 5 from the midpoint.

2. Let the large basket have x kg of apples, and the small basket has (130-x) kg of apples 5 6x: (130-x+1 6x) = 7 6 solution x = 84

That is, the original apples in the large basket are 84 kg, and the original apples in the small basket are 130-84 = 46 kg.

3. There are x pages in the book.

2 5x+4+2 5x): 5=x-2 5x-2 5x-4 gives x=120

Number of pages left = 120 times 1: (5+1).

That's 130 times 1 6

Count the number of pages you have left.