Asking a few math questions in a hurry for the sixth grade is very exciting

1. Drive 200 kilometers on the first day and 200 * 6 5 = 240 kilometers on the second day.

The third day is 3 11 of the whole journey, then the sum of the distance traveled in the first two days is 8 11 of the whole journey, so the whole journey is (200 + 240) divided by 8 11 = 660 kilometers.

2, have read 240 * 2 5 = 96 pages.

The ratio of what is left to what has been read is 1:3, so what has been read is 3 4 of the pages of the whole book, so 240 * 3 4 = 180 pages.

then 180-96 = 84 pages. So look at page 84 again.

3. Each circle inside is 1 4 less than the outer circle, so the number of people who differ in each circle is 48 * 1 4 = 12 people.

That is, the penultimate lap is 48-12 = 36 people, and the third to last lap is 36-12 = 24 people.

The innermost lap is 24-12 = 12 people.

If the whole distance is s, then: 200 + 200 * 6 5 + s * 3 11 = s solution : s 605 (km).

I have read 240*2 5 96 (pages).

When the ratio of the rest to what has been seen is 1:3, the rest is 240*1 (1+3) 60 (pages).

The number of pages to be read again is.

240-60-96 84 (pp.).

The number of people in the second outer circle is 48 * (1-1 4) = 36 (people), and the number of people in the third circle is 36 * (1-1 4) 27 (people) 27 is not divisible by 4 So the third circle is the innermost circle, and there are 27 people in the innermost circle.

3. Second round: 48*(1-1 4)=36 people.

Third Lap: 36 * (1-1 4) = 27 people.

27 people multiply by 3/4 to get the decimal number, and the number of people cannot be a decimal number, so it is best to have 27 people in a circle.

1.(200+200*6 5) (1-3 11)=605 km.

2.Set: Look at page x again.

240-240*2 5-x:240*2 5+x=1:3x=person).

36*(1-1 4)=27 (person).

27*(1-1 4)=person).

Because it is an artificial integer, there are 27 people in the innermost circle.

Question 1: If the whole journey is x km, then (3 11) x km is traveled on the third day, and 200 * (6 5) = 240 is driven on the second day(1st day + 2nd day + 3rd day = full journey).

Solve x=660 from the equation of the question column: 200 + 240 + (3 11) x=x

So the whole journey from A to B is 660 kilometers.

Question 2: I have read 2 5, that is, (2 5) * 240 = 96 pages. There are also 240-96 = 144 pages.

Let's look at the ratio of the rest of the page to the one that has been seen is 1:3(Remaining: Seen = 1:3, i.e. Remaining *3 = Seen.)

The equation is defined by the proposition: (144-x)*3=96+x. Solve x=84

So if you look at page 84 again, the ratio of what is left to what you have read is 1:3.

Question 3: From the meaning of the question, the inner circle is 3 4 of the outer circle, and the second circle is: 48 * (3 4) = 36

The third lap is: 36 * (3 4) = 27

Since 27 is not divisible by 4, there are only three turns.

So there are 27 people in the innermost circle.

1.200*6 5=240 (km).

240 + 200 = 440 (km).

440 divided by 8 11 = 605 (km) Answer.........3 divided by 4 = 3 4

240*3 4=180 (page).

240*2 5=96 (page).

180-96=84 (pages) Answers.........

36 (person) 36 * 3 4 = 27 (person).

A.........

Ask the teacher. There you know.

I don't know yet! lj

1: Let the radius of the bottom surface be x cm, then the length of the rectangle is 2x+2 x=10 The volume is: ml).

2: The cross-section along the diameter is exactly a square, indicating that the height and the bottom diameter are equal, and the bottom diameter is decimeters.

The volume of this steel is cubic decimeters).

3: The base area of B is (4) times that of A, and the ratio of the side area of B to the side area of C is: 1 1 The volume of B is 2 times the volume of A.

1. Set the bottom radius of the paint bucket to be x

2x＋π×2×x=

x=10v= 10 4 10=12560=12560ml2, the bottom circumference of this cylinder is decimeters, diameter = height = 1 2 = 2dm

v = 3, r A = r B 1 2 r C 2, h C = h A 2 h B 4 The bottom area of B is several times that of A: r B r A = r B r A =2 =4

The ratio of B's side area to C's side area is:

rB 2 h B: r C 2 h C = r B r C h B H C = 4 1 4 1 1 :1

The volume of B is several times that of A: r B h B r A h A 4 h B h A 4 h B h A 4 1 2 2

The planned working period is 1 year = 12 months.

The working time is 7 months.

Time difference: 12-7=5 months.

Salary difference: 12000-5000 = 7000 (yuan) monthly salary; 7000 5=1400 (yuan).

Working for 7 months, the salary due: 1400 7 = 9800 (yuan) The value of this motorcycle: 9800-5000 = 4800 (yuan) Comprehensive formula: (12000-5000) (12-7) 7-5000 = 4800 (yuan).

The monthly remuneration is equal to 1 12 plus 12000 12 = 1000 yuan for the motorcycle and is also equal to 1 7 plus 5000 7 = 5000 7 yuan for the motorcycle

4800 yuan.

It is worth 7,000 yuan for five months, and 1,400 yuan per month.

7 months: 9800 RMB.

So the motorcycle is worth 4800 yuan.

12000-5000=7000, which means that he has not worked for 5 months, then the salary of one month is 1400, 1400 12-12000=4800 yuan. So the value of the motorcycle is 4800 yuan.

7 12 (12000 + motorcycles) = 5000 + motorcycles in 7 months.

So motorcycle=4800

A year is 12 months, if the monthly remuneration is x yuan, and the motorcycle is y yuan, the equation system 12x=1200+y and 7x=5000+y, the solution can be x=1400, y=4800, so the motorcycle is 4800 yuan.

Hello! 7 months, should get 7 * 12000 12 7000, and 7 12 motorcycles, solution: set the motorcycle value x yuan, then there is.

7000＋7x/12＝5000＋x

Solve x 4800

I hope you are satisfied with my answer! Thank you!

Personally, I think that corange0910, although the shortest, is the most accurate and concise.

Let the motorcycle value be x yuan, you can list the equation 7 12 (12000 + x) = 5000 + x to calculate the value of the motorcycle, that is, x is 4800 yuan.

1,3/15=8/40

2. Pi is the ratio of perimeter to area.

The factors of 3,15cm*60000=900000cm=9000m4,18 are, 3 9 = 6 185Two and a third of the reciprocal 3 7

6.Inverse proportional, proportional, proportional.

:15=8:40

2.The circumference and diameter of the circle.

5.Three-sevenths.

6.Inverse proportional, proportional, proportional.

3：8=15：40

Circumference Diameter.

The factors of 15cm*60000=900000cm=9000m18 are, 1:2=3:6, two and one-third reciprocal 3 7

Inverse proportional, proportional, proportional.

1. 15：3 40:8

2.The circumference and diameter of the circle.

4. 1,2,3,6,9,18 （2×9）：（3×6）5.1:2 and 1/3 6/7:2 66/7Anti-positive.

Running water 1There is a boat that travels in a 120-kilometer river, and it takes 10 hours to go against the road and 6 hours to go forward, and find the speed of the boat and the speed of the water.

Answer: Countercurrent velocity: 120 10=12 Note that the unit is omitted.

Forward velocity: 120 6 = 20

Speed: (20+12) 2=16

Water velocity: (20-12) 2=4

Answer: Slightly.

You're asking the right question.

1.(200 14 4) (1 1 5 "1 5 means one-fifth, and I won't say it later.") 1 4) 80 (pcs).

Equation: Solution: Let the apprentice do x pieces.

1/5x+14）/（1/4）+x=200x=802.Calculation: 180 (3 5) = 180 (5 3) = 300 (km).

Equation: Solution: Let the distance between A and B be x kilometers.

x-180+20%x）=3(180-20%)2x-360+40%x =540-40%x2x+x =540+360

3x =900

x =300

3.Calculation: 420 (3 4 2 3 1) 175 (km) Equation: People also make mistakes, I forget. =

That's it = =

There is also the addition of verification and math that will not be added.

1. If the apprentice has done x, the master has made 200-x.

Then there is the equation (200-x) 4-x 5=14

36=9x/20

x=802, let A and B be separated by x

x-180+((

1.Design: The apprentice made x and the master made y.

x+y=200, (1 4)y-(1 5)x=14 solution: x=80 y=120

A: The apprentices made 80 of them.

2.Set: A and B are x kilometers apart.

x-(:3 solves: x=300

A: A and B are 300 kilometers apart.

3.The distance between car A and its destination after 5 hours is: 420 (1 4) = 105 (km).

After 5 hours, the distance between car B and the destination is: 420 (1 3) = 140 (km), at this time, the distance between the two cars: 420-(105+140)=175 (km).

1.Solution: Set up apprentices to do x.

200-x）1/4=1/5x+14

x=80 Answer: The apprentice made 80.

2.The ratio of the distance traveled to the total distance traveled is 3:5

The untraveled distance is 2 5

Solution: Set the whole journey x kilometers.

2/5x+20％x=180

x=300A; The total distance is 300 km.

1., apprentice do x

200-x)/4=x/5+14

50-x/4=x/5+14

x/5+x/4=50-14

9x/20=36

x=80 2, Analysis:

It is known that after a certain distance, there are still 180 kilometers away from place B, and then 20% of the whole journey is 1/5, and the ratio of the distance traveled to the distance not traveled is 3:2, so it can be seen that the distance traveled at this time is 3/5 of the whole journey, and the untraveled distance is 2/5 of the whole journey, so when there are 180 kilometers to go to place B, the untraveled distance is 3/5 of the whole journey

That is, 3/5 of the whole journey is equal to 180 kilometers.

Therefore, the distance between A and B is 180 (3/5) = 180 (5/3) = 300 km.

The composite formula can be listed as: 180 (20% + 2/5) = 180 (3/5) = 180 (5/3) = 300 km).

(3/4 2/3 1) 175 (km).

1.Analysis: Assuming that the 1 4 made by the master is equal to the 1 5 made by the apprentice, then the master has 4 fewer "14 parts" than the actual parts, that is, (14 4).

Answer: (200 14 4) (1 1 5 1 4) 80 (pcs).

A: The apprentice made 80 parts.

2.Analysis:

It is known that after a certain distance, there are still 180 kilometers away from place B, and then 20% of the whole journey is 1/5, and the ratio of the distance traveled to the distance not traveled is 3:2, so it can be seen that the distance traveled at this time is 3/5 of the whole journey, and the untraveled distance is 2/5 of the whole journey, so when there are 180 kilometers to go to place B, the untraveled distance is 3/5 of the whole journey

That is, 3/5 of the whole journey is equal to 180 kilometers.

Therefore, the distance between A and B is 180 (3/5) = 180 (5/3) = 300 km.

The composite formula can be listed as: 180 (20% + 2/5) = 180 (3/5) = 180 (5/3) = 300 km).

3.420 (3/4 2/3 1) 175 (km).