Six math questions, ask for answers!!!! Bonus points will be awarded

1. C is only 2 correct, and the opposite of 0 is 0

2. Because there is no 0th floor, 26-(-5)=31, so it is 31-1=30th floor. The answer is 30.

The specific understanding is that 5 floors are needed for the first floor of the 5th floor, and 25 floors are needed from the first floor to the 26th floor, for a total of 30 floors.

25+, up to a difference; Look at it clearly that there are 3 brands, and not every brand only has one bag.

4, and 5, a set of positive integers: 6, 7

Negative Score Collection: Negative three-quarters.

Non-negative rational numbers: 6, 0, 3/16, 7

Set of non-positive rational numbers: -3, minus three,,- 16,0 (0 is not a positive number) Set of non-positive integers: -3,0,-16

6. Total planned amount = 49200

Therefore, the company has to give 48w to reward all groups first.

Then, according to each group, the total expenditure = 480000+270000-15*8000 = 630000

I'll give you extra points! 1. From 2x 9=2-(m-2)x: mx=-7, to make 2x 9=2-(m-2)x have a solution in the integer range, that is, mx=-7 has a solution in the integer range, then m=-1, m=7,

1.C Solution: Only 2 is right.

4.And. 5.Set of positive integers: 6,7

Negative score set: -3, minus three-quarters,,- 16

Non-negative rational numbers: 6, 0, 3/16, 7

Set of non-positive rational numbers: -3, minus three-quarters,,- 16 sets of non-positive integers: -3, 0, -16

There is ambiguity in this question, here the non-positive and integer are read separately, and if you divide them into non-positive and positive integers, the answer is different.

6.The question is missing a group's value and can't be calculated.

A = 2x3x3xa, has = 5x7xb, the greatest common factor of A and has is 15, then a = (5), b = (3), A, has the least common multiple is (630).

3.The question is incorrect.

The sawn square block is 12 centimeters long.

You can saw 2*3=6 pieces.

The maximum distance between the red flags is 12 meters, and there are (4+1)*(3+1)=20 red flags.

1.Let the length of the rope = y, y 3-4 = y 4-1

y/12=3

Rope length y=36 feet.

Well depth = y 3-4 = 8 feet.

2 If you should buy $ x now, then there is.

x(1+Calculate: x=9977

So now you should buy 9,977 yuan treasury bonds.

3 If each payment is $x, there is:

x=（8224-x）（1+

Obtained: x=4224 yuan.

So you should pay 4224 yuan each time.

4 According to the title, the volume before and after remains the same, and the thickness is xcm, then there is:

200*100*1=320*100*x

Find: x=so the later thickness is.

5 By the title, the volume before and after forging remains unchanged, and the length of the steel rod is xm, 1cm=, then there is:

Find x=16

So the later length was 16m

6. If the original price of commodity A is x yuan, then the original price of commodity B (500-x) yuan is:

i) Find: x=320

Therefore, the original price of A is 320 yuan, and the original price of B is 280 yuan.

or (ii) x = 155

Therefore, the original price of A is 155 yuan, and the original price of B is 345 yuan.

7 According to the inscription, A and B complete one-third and one-fifth of the entire work respectively every day, and if it takes x days to complete 80% together, then there is:

1/3）+（1/5）]x=

Find: x=so it takes a total of days, i.e. it takes a day and a half.

But I don't know about this question, I'm counted in the book, I'm sorry, I can't help you!

(I have revised the first question, but I was the first to answer all your questions, but now I have to revise it, and I despise the person who copied my answer the most!! Again, I finished answering all your questions at 19:51, and I typed them out one by one. And I'll tell you that the answer to the second question is an approximation, which is rounded, and you will know it if you don't believe it.

Solution:1Let the length of the rope = y, y 3-4 = y 4-1

y/12=3

Rope length y=36 feet.

Well depth = y 3-4 = 8 feet.

2 If you should buy $ x now, then there is.

x(1 + cubic = 10867.)

Find: x=9977

So now you should buy 9,977 yuan treasury bonds.

3 If each payment is $x, there is:

x+（8224-x）（1+

Obtained: x=4224 yuan.

So you should pay 4224 yuan each time.

4 According to the title, the volume before and after remains the same, and the thickness is xcm, then there is:

200*100*1=320*100*x

Find: x=so the later thickness is.

5 According to the inscription, the volume before and after forging remains unchanged, and the length of the steel rod is x meters, then there is:

Attention Units) *

Find x=16

So the later length was 16 meters. (Note that it is not cm but m) 6 If the original price of commodity A is x yuan, then the original price of commodity B (500-x) yuan, then there is:

Find: x=320

Therefore, the original price of A is 320 yuan, and the original price of B is 280 yuan.

7 According to the inscription, A and B complete one-third and one-fifth of the entire work respectively every day, and if it takes x days to complete 80% together, then there is:

1/3）+（1/5）]x=

Find: x=so it takes a total of days, i.e. it takes a day and a half.

(I have revised the first question, but I was the first to answer all your questions, but now I have to revise it, and I despise the person who copied my answer the most!! Again, I finished answering all your questions at 19:51, and I typed them out one by one. And I'll tell you that the answer to the second question is an approximation, which is rounded, and you will know it if you don't believe it.

Question 1: Let the well be x, 3x+4=4x+1 x=3, so the well is 3 meters, and the rope is 13 meters.

Question 4: 200*100*1=320*100*x x=

I did two questions, and I also added points.,Hehe-hee.。。。 I don't have time, so I'll take a look at it when I have time.

1 can know that there are 91 digits in this multi-digit number, remove 80 digits, and there are 11 digits, whichever is larger, and the maximum number of 11 digits can be 99997484950.

21.Suppose 1 to 9 are all single digits, and there are 1+2+3+. 9 = 45, 99 less than 99 - 45 = 54, 2For example, when you put 6 in the 10th place, add 60-6=54, put 1 and 5 in the 10th place, and increase 10-1=9 and 50-5=45 to 54, and put 2 and 4 in the 10th place, and put 1 and 2 and 3 in the 10th place.

3.There are 4 ways to number groups:

4.(1) 6 and 1 are matched into 61, 6 and 2 are matched into 62,,,69, and there are 8 kinds of combinations.

2) Put 1 and 5 in the ten places of 2, 3, 4, 6, 7, 8, 9, and have 6+5+4+3+2=21 (kinds).

3) Put 2 and 4 in the 10th place of 1, 3, 5, 6, 7, 8, 9, there are also 21 different combinations.

4) Put 1, 2, and 3 in the 10th place of 4, 5, 6, 7, 8, and 9, and there are 30 different combinations.

There are 8 + 21 + 21 + 30 = 80 (groups) of group number methods.

3 out of 31 5 + 1 = 156 pairs. (2) It is easy to know that if 9 numbers do not form two digits, 99 cannot be added, because 1+2+......9 = 45

Let 9 numbers be combined, and the sum of the numbers placed in the 10 place is x (x<10).

Then the sum of all single digits = 45 - x.

The sum of the combined numbers = x 10 + 45-x) = 99

Solution x = 6.

Discussion on a case-by-case basis:

a. When x is added by 1 number, this tens of digits are 6, and there are 8 possibilities for single digits. There are 7 1-digit remaining. For example;

b. When x is added by 2 numbers, the combination of ten digits (1,5) or ), each group has 7 6 = 42 possibilities, a total of 42 2 = 84 possibilities. There are 5 1-digit remaining.

c. When x is added by 3 numbers, the combination of ten digits ), a total of 6 5 4 = 120 possibilities. There are 3 1-digit numbers left.

To sum up, there are a total of 8 + 42 + 120 = 170 different ways to number groups.

Solution: Let the actual length of the car be x.

Then: 1 to 24 = to x

then x = 24 times.

Solution: Let the model length of the bus be x.

Then: 1 to 24 = x ratio.

then x=(I hope it can help you o( o)

, get a=, the actual length of the car.

b, get b=, the length of the bus model is 49cm

Elementary school students' questions... Actual length = model length * 24 car reality.

Bus model length.

Pay attention to the units.

1: According to the topic: let the actual length of the car be x, then: 1 to 24 = x x = x = 24 times.

2: According to the title: if the model length of the bus is x, then: 1 to 24=x to x=

The car factory produced a batch of car models according to the ratio of 1:24, the car model is long, what is its actual length?

1. Fangfang has a mail.

Ticket 80 2 5 = 200 pieces, ready to hand over the source for 200 3 10 = 60 pieces 2, the first bai

1620 9 10 = 1800 in the second batch and 1800 13 15 = 1560 in the third batch.

3. From the question, it can be seen that the whole process of dao1-3 5=2 5 is 52 kilometers, so the distance traveled by the car is 52 2 5=150 kilometers, and the speed is 150 3=50 kilometers hour.

4. Multiply both sides of the equation by 20 to get 20x+3x=1380, 23x=1380, x=60

1.Fang Fang Post bai

Votes: 80 2 5 = 200 (piece du) zhi

Number of stamps exchanged: dao200 3 10 = 60 (pieces) within 2The number of chicks hatched in the second batch is 1620 9 10 = 1800 (only) The number of chicks hatched in the third batch is 1800 13 15 = 1560 (only) 3, as can be seen from the question, the distance between the whole process of 3 5 and the whole process of 1 2 is 52 kilometers, so the distance of the whole journey is 52 (3 5-1 2) = 520 kilometers, and the distance that the car has traveled is 520 3 5 = 312 (km).

The speed is 150 3 = 50 km/h.

4. Equation x+3 20x=69

Merge homogeneous items 23 20x=69

The coefficient is 1, x=69 23 20=60

Divide by two-fifths = 200 200 times three-tenths = 60 Answer

Divide by nine-tenths bai = 1800 1800 times thirteenths of fifteenth du = 1560 A:

Hour line zhi complete range 52 divided by 10 quarters dao = 130 km 130 divided by 5 = 26 km per hour Answer:

4.Solution: 23/20 x = 69

x = 69 divided by twenty-three out of twenty.

x=60 watchtower lord adopts!

Solution: The stamps of Fangfang are 80 divided by 2 5 = 200 (pieces) 200 times 3 10 = 60 (pieces).

Second batch: 1620 divided by 9 10 = 1800 (only) Third batch: 1800 times 13 15 = 1560 (only) 52 divided by (3 5-1 2) = 520km 3 5 times 520 divided by 3 = 104km h (is it the end point or the midpoint?)

x+2/3x=69 5/3x=69 x=

1.80 2 5=200 200 3 10=60 (pieces) Answer: Fang Fang is ready to exchange 60 stamps.

Within 1560 (only) Answer: The third batch of hatched small chickens is 1560.

104 (km) A: The car travels 104 km per hour.

4. x+3/20x=69

1 and 3 20x=69

x=60

Divide 2/5 by 3/10 21620 divided by 9/10 multiplied by 13/15

1.Let a box of biscuits be $ x (x is an integer), and a bottle of milk y yuan x < = 10

x+y>10

Solution: x=9,y= or x=10,y=

Biscuits and milk are priced at $9 and $10 and $1, respectively

m+4) (2+4)=(2m+3) (4+3) solution: m=2

4=(3*2+4) (2*3+4)=1 According to the requirements of the nine-square grid: the horizontal and vertical oblique numbers must add up to the same, before they are calculated, such as 1, 2, 3, 4, 5, 6, 7, 8, 9 These 9 numbers, the three horizontal rows add up to 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45

Each row = 45 3 = 15

Therefore, we know that the horizontal and vertical numbers add up to 15