Equation application problems, I don t know, everyone pity me, help me 10

If x small flags are set, it was originally planned to take x 40 days, but it actually took [ 1 3 x 40 2 3 x 80] days

x 40 [ 1 3 · x 40 2 3 · x 80] = multiply both sides by 240 to get 6x 2x 2x = 3602x = 360

x = 180, if the distance between ab and the two places is x km, then it takes 1 3 x 60 hours on the ordinary highway and 2 3 x 100 hours on the highway

From the title 1 3 x 60 + 2 3 x 100=x 60 + 2x 100=

5x +6x=

11x=66×30

x=180

1.Solution: Make a total of x small flags.

x 40-(x 3) 40-(2x 3) 80 = Solve this equation

x=180 has been tested and is in line with the topic.

A: A total of 180 small flags were made.

2.Solution 1: (Binary Linear Equation Solution).

The time for driving on a normal highway is x, and the length of an ordinary highway is y.

The length of the ordinary highway travel time The driving speed, ie

y=60x ..

Length of the highway = travel time Travel speed = (

The length of the highway (two-thirds of the total length) = the length of the ordinary highway (one-third of the total length) 2, there is:

2y=100( .

A binary linear equation is formed by and

y=60x ..

2y=100( .

Solution: x = 1 hour.

y = 60 km.

Then the length of the highway = 2y = 120 km.

The driving time on ordinary roads is 1 hour and the length is 60 km;

The driving time of the highway is hourly and the length is 120 km.

Solution 2: (Unary Linear Equation Solution).

The time set for driving on ordinary roads is x

then the time spent driving on the highway.

Length of ordinary highway = travel time Travel speed = 60x length of highway = travel time Travel speed = 100 (length of highway (two-thirds of the total length) = length of ordinary highway (one-third of total length) 2 = 60x 2 = 120x

Then there is: 120x=100(

Solution: x = 1 hour.

Then: Time spent on ordinary highways = 1 hour.

Time spent driving on the highway = hours.

Length of ordinary road = 1 hour 60 km h = 60 km.

Length of highway (hours 100km h = 120km.)

Hopefully, thank you

1.(1) If Chen Li is correct in all 11 questions, the score is: 11 10 = 110 (points).

Now I only get 78 points, which is 110-78 = 32 (points) less, because it is 10 + 6 = 16 (points) less to change from a correct question to a wrong question

Therefore, there are 32 16 = 2 (questions) that are wrong, and 11-2 = 9 (questions) that are correct

2) The solution is the same as above, and the equation is.

14 10-40 = 100 (points) 100 16 = questions).

I guess you copied the wrong number in this question)

people) 3I think that the time to spend less is to let the best people go early, and the others need to fetch more water later. In this way, people with few hot water bottles will leave after playing, and they don't have to wait. So the total time I calculated was:

1+(1+2)+(1+2+3)=10 (minutes).

Answer: First Aunt Wang, then Aunt Zhang, then Aunt Li. It takes 10 minutes in total.

tree) a tree that carries a tree on one side.

26-1=25 (pcs) The number of intervals in common.

75 25 = 3 (m).

A: The distance between two adjacent trees is 3 meters.

5."After the game, it was found that the statement of ** was half correct", indicating that the first person said and the second person said half of what was right, that is, A is either the second or the first; Ding is either third or second.

The third person said, "C is second and D is fourth", and D is not fourth when he is not, so C is second.

C is the second, and A cannot make the second, so A is the first.

A is the first, which means that it is wrong for the first person to say that A is the second, and D is the third. So Ding is the third.

There is one B left, and it is the fourth.

Summary: A is the first, C is the second, D is the third, and B is the fourth.

Hypothetical Method:

Assuming that all 20 questions are correct, you can get: 5 20 = 100 points.

The actual score is 76 points, which is less: 100-76 = 24 points, and for each wrong question, it is less: 5 + 3 = 8 points.

False: 24 8=3 questions.

True: 20-3=17 questions.

Equation Method: Solution: Set x questions correctly and 20-x questions wrong.

5x-3(20-x)=76

5x-60+3x=76

8x=136

x=1720-x=20-17=3

Answer: Do 17 questions correctly and do 3 questions incorrectly.

Li Jing got the X question right.

5x-3(20-x)=76

Solution: x=17

I got 3 questions wrong.

Question 1: 1) Because: Divisor Divisor 5=179

2) Findable: the sum of the dividend and the divisor: 179 5=1743) and because:

Dividend divisor = 5......Here it says that "the dividend is 5 times the divisor". The divisor is 1 part and the dividend is 5 parts, then, the two have a total of (1 5) parts, which is exactly 174, and we can find the amount of 1 part (i.e., the divisor).

4) Divisor: 174 (1 5) = 29

5) Dividend: 29 5 = 145 or.

Question 2: 1) Write the following two relationships:

3 thermos 20 cups = 134

3 thermos 16 cups = 118

2) Observe the left side of the two equations, and find that the hot water bottle is the same, and the difference between the teacups is (20 16), which is exactly (134 118) yuan. In this way, we can find the unit price of 1 teacup.

3) The unit price of a teacup: (134 118) (20 16) = 4 (yuan) 4) The unit price of a water bottle: (134 20 4) 3 = 18 (yuan) 3 questions: 1) Chinese mathematics = 187

Mathematics English = 197

Language: English = 186......The results of all three subjects were repeated twice.

2) The sum of the scores of Language, Mathematics and English: (187 197 186) 2 = 285 (points) 3) English: 285 187 = 98 (points).

4) Language: 285 197 = 88 (points) or 186 98 = 88 (points) 5) Mathematics: 285 186 = 99 (points) or 197 98 = 99 (points) 4 questions:

1) Xiao Ming's 4-minute running distance: 60 4=240 (m) 2) Xiao Ming's return ran a few meters: 240 200=40 (m)3) Xiao Mei's 4-minute running distance:

200 40 = 160 (m) 4) Xiaomei's speed: 160 4 = 40 (m).

A type A tractor can plow half of a piece of land in 4 days, and it can be ploughed in 8 days, so a type A tractor can plow 1 8 of a piece of land in 1 day. If the B negotiation tractor can plough the land in x days, then the B tractor can plough 1 x of the land every day. According to the conditions of the banquet:

Two units work together, and the other half of the land is ploughed in 1 day. Columnable equations. Solving this equation gives us x 8 3

It takes x days for B to complete the cultivation alone.

1 Carry Jane 2 4+1 x=1 2

1 pie bend 8 + 1 x = 1 2

1/x=1/2-1/8

1/x=3/8

x=8 3 Answer: It takes 8 3 days for B to finish plowing alone.

120/(x-2)-120/x=3

or Argument Pants: 120 x + 3) * (x - 2) = 120

To explain the previous problem in another way, 2 units of the same ploughing completed the work done by A in 1 day in only one day, so B worked 3 times the amount of dust per day as A, A needed 8 days, then B needed 8 3 days.

Column equation, let B change x every day, and A plough 1 8 per day

then x+5 8=1

So x=3 8

Requires 1 x = 8 3

If it takes x days to cultivate alone, then plough 1 x per day

5×1/8+1/x=1

Solution x=8 3

Question 2. The original plan produces 120 x per day

Actual production of 120 x+3 per day

then (3+120 x)(x-2)=120

The solution is x=10

Solution: If the cultivated area of the shirt is 8, then v A = 1 day, and if v B = x, then.

x+1=4x=3

Hood tung needs a wheel cavity for 8-3 days.

x-2）×（120/x+3）=120

1.Let the work efficiency of A be a, B be b, and half of the land is y4*a=ya+b=y

Get: b = (3 4) wisdom y

Then 2y=(former hail source 8 3)b

It takes 2 and 2 3 days.

1. It takes x days to set up a B-type finger to drag and bend the tease machine to cultivate this land alone.

1/2÷4+1/x=1/2

1/8+1/x=1/2

x+8=4x

x=8 3x=(120+3) (x-2)

120x=123x-246

3x=246

x=82

It turns out that the boy is 56 * (5 7) = 40

Now girls 40 8 * 7 = 35

Now it's a total of 35 + 40 = 75

56*5 7=40 boys.

The male-to-female ratio is 8:7, so there are 35 girls.

Originally, there were 40 boys and 16 girls, and the girls who joined later were x, so 40:16+x=8:7, and x=19, so now there are 75 people in the swimming team.

First of all, 56 5 7 = 40, then there are 40 boys and 15 girls. Then the ratio of men to women is 8:3, and it becomes 8:7, that is, the ratio of girls increases by 4, and the number of girls increases by 4 5 = 20, so the number of swim team is now 75.

56 of them, of which 5 7 were boys and 40 were boys.

40 x = 8 7 The total number of girls is 35.

There are 75 people in total.

Question 1: Because it is in the same direction and place at the same time, you draw the distance by yourself, 18 hours Min Zheng wait for boat B to exceed the meter of boat A, the time is 18 hours, the distance of boat B minus the distance of boat A, let the blind equal to the distance difference of kilometers assuming that the speed of boat B is x kilometers per hour.

18x-18* x=

Question 2: The length of the circular track is equal to the sum of the distances traveled by two people 3*50+5*50=400 meters.

1) Set up the B boat to travel x kilometers per hour, according to the old scumbag's intentions; The type contains resistance to 18 (Bu Chun.

2) l runway (3 + 5) * 50 = 400

Rent relief: Guess carefully that ship B travels a kilometer per hour. 50x3+50x5=150+250

18a-585 = = 400 (meters).

18a=a=A: Ship B travels kilometers per hour. Zhaoli Answer: 400 meters long.

4. You first calculate how long the road is.

40*15=600 meters.

3 days in advance, that is, it actually took 15-3=12 days.

An average of 600 per day divided by 12 = 50 meters.

5. From 4:30 p.m. to 16:30 p.m

Uncle Li's working hours are 16:30-8:30 = 8 hours and subtract 2 hours: 8-2 = 6

Do 58*6=348 in a day.

=20×23

460 (pcs).

680-460 = 220 (pcs).

A: 460 parts were processed in 23 days, and 220 were left to be done.

45 (tickets) A: 45 child tickets were sold.

46 (yuan) A: 46 yuan per woolen sweater.