2 elementary math problems with additional marks .

The first four points of Question 1 can be 90 + 89 + 88 + 87 = 354 points, and the lowest score can be at least 404-354 = 50 points.

Question 2 appears to be a perfect square number less than 70 3 = 210 and greater than 3 60 = 180.

Because 14 14 = 196 and 15 15 = 225, there were 196 people who participated.

The lowest score is at least: 404-90-89-88-87 = 50 (points) A group of people to play, first take a car, 4 cars that need at least 60 seats, then take a boat, need at least 70 seats 3 boats, after arriving at the destination, they are divided into groups, the number of groups is as many as the number of people in each group, how many people participate in the play?

3 boats with at least 70 seats, with more than 70x3 = 210 people in groups as many as the number of people in each group.

15x15=225 (person).

225 people need at least 60 seats in 4 cars, which is in line with the topic.

So the number is 225 people.

1,404-90-89-88-87 = 50, at least 50 points 404-90 = 314, the average score of the remaining four is 314 4=, and they are all whole numbers, the closest of the four is the most scored, 80, 79, 78, 77

The last place has a maximum of 77 points.

2,196 people:

The number of people should be between 60x3=180 and 70x3=210.

If there is one less 60, some people will not be able to sit down, and if there is one less 70, some people will not be able to sit down.

Between 180 and 210, only 196 is the square number (14 squared), so the number is 196.

First of all, the highest score of these 5 people is 90, then the sum of the total score of the remaining 4 people is 404-90 = 314 points. Because the highest score of 90 points is the lowest score among the 4 people, the score of three of them should be second only to 90 points and cannot be repeated, in order of 89, 88,87 so the minimum score is 314-89-88-87 = 50 points.

The number of people should be between 60x3 = 180 and 70x3 = 210, and between 180 and 210 there is only 196 squared (14 squared), so the number of people is 196.

1.Everyone doesn't score equally; The first four people can be set to score as; So the lowest person score is at least 404-90-89-88-87=50

2.The number of people should be between 60 times 3 = 180 and 70 times 3 = 210 Ya only 196 is the square number [14 squared], so the number of people is 196

If C buys the auspicious letter and celebrates the x copies, then B buys 2x copies, so A is 47-3x the book.

47-3x)*

x=9 so Tanmeng: 2x=18 47-3x=20A: A bought 20 copies, B bought 18 copies, and C bought 9 copies.

It's okay to let the socks collapse to x.,And then B is 2x.,A is good to sell and it's 47-3x.,And then it's not simple.,7 (47-3x)+3 2x+2x and then find x and it's OK.

1.In order to make the lowest score, it is necessary to make the score of others the highest, and because everyone's score is not equal, only the first four people score respectively: 90, 89, 88, 87, and the last person scores the lowest, that is, 404-90-89-88-87 = 50, so the lowest score is at least 50 points.

2.From the first condition, it can be seen that the number of people between 180 and 240 has the second condition:

The number of people between 140 and 210 can be seen by combining the first two conditions: the number of people between 180 and 210 has the third condition: the number of people is the square of a certain number.

And only 14 squared, i.e. 196, meet the condition.

So 196 people took part in the trip.

1. 404-90-89-88-87 = 50 (min) 2 60 * (4-1) people "Number of people< 70 * 3 people 180 "Number of people< 210

Number of groups divided = number of people in each group.

So the number of people = 196 people (square number).

Is there a third question?

(1) The sum of the scores of the remaining four is 314 In order to qualify for the lowest score, the score of the remaining four should be as close to 90 as possible

Now suppose that three of the other four have a score of 90, then the lowest score is 44, and each person has a different score, so the score is 89, 88, 87, so the lowest score is 50

2) Let the number of people in each group be x

Then the total number of people is x*x

Also know 60*3 x*x 60*4

2*70≤x*x≤70*3

Simultaneous two-style, solution.

Since the number of people is an integer.

So x=14

So a total of 14 * 14 = 196 people participated.

Four of them are counted according to the possibility of the highest score, 90, 89, 88, 87. 50 points for the last person. If it is less, there will be a double score.

According to the title, the number of people cannot be greater than 70 * 3 = 210 (3 boats that need at least 70 seats), not less than 60 * 3 = 180 (4 cars with at least 60 seats), and it must be the square of the whole number (the number of groups divided is equal to the number of people in each group), it can only be 14 squares, a total of 196 people.

points, the highest is 90, to be the lowest, the other three points should be 89, 88, 87, so 404-90-89-88-87 = 50

2.It can be obtained by car, the number of people is greater than 60 * 3, less than 60 * 4, and the number of people can be seen to be greater than 70 * 2 and less than 70 * 3, so the number of people is greater than 180 and less than 210, because the number of groups is 13 * the number of people in each group is 13<180, 15 * 15 > 210, 14 * 14 = 196, so there are 196 people participating in the trip.

Kilogram 2Original formula = 1/1 of (1*3) + 1/1 of (3*5) + 1/1 of (5*7) + 1/1 of (7*9) + 1/1 of (9*11).

1/2 * (1-1/3) + 1/2 * (1/3 - 1/5) +1/2* (1/9-1/11).

1/2* (1/3 + 1/3 1-5/5 + 1/5 1-7/7 + 1/7 1-9 + 1-1/9)

1/2 x 10/11

53 out of 11Set up the original X people in Group B, and 4X-3 people in Group A out of 5.

3/4 * (x-1) = 4/5x-2

3x/4 - 3/4 = 4x-2/5

1x 20/2 = 2-3/4

x=25 Group A originally 4/5 * 25-3 = 17 people.

4.Original = 2006/2007 * (2007+1).

2006/2007*2007 + 2006/2007

2006 + 2006/2007

2006 and 2006/2007

ml = 2100 kg.

6.The remaining 1/4 = original (1-1/4) * 1/4 = 3/16

12 3/16 = 64 pages.

Pages occupy 1/1 of (1+3) - 1/7 of the book = 3/28

12 3/28 = 112 pages.

8.Because the money from the eldest accounts for 1/2 of the other 3 people, the second out accounts for 1/3 of the other 3, and the third person accounts for 1/3 of the other 3 people, so the money from the eldest accounts for 1/3 of the 4 people, the second child accounts for 1/4 of the 4 people, and the third person accounts for 1/5 of the 4 people

Set up air conditioning x yuan.

1/3x+1/4x+1/5x+520=x

x=2400

9.Number of participants: 95 * 2/5 = 38

Boys: 38-18=20.

20 95 = 4 out of 19

10.A travels 30 kilometers more than B.

30 1/24 = 720 km.

11.Let A x, B y.

1/6x=3/4y

1/5x=y-2

The solution is y=20

x = 2/90 * 2/5 * 2/5 = m.

Question 1: 30 1 5=6kg, A and B are now both: 30-6=24kg, then B was: 24-6 2=12kg.

Question 2: We tend to think that 2 3 = 1-1 3;2/15=1/3-1/5；2/35=1/5-1/7。。。

Therefore, multiply each addition of the original question by 2 to decompose, and divide it by 2 after calculating

Original = (1-1 3+1 3-1 5+1 5-1 7+1 7-1 9+1 9-1 11) 2

Question 3: To be continued.

1.When f=100, c=5 9(f-32)=5 9(100-32).

A person's body temperature may reach 100F.

2x2+3x=3

6x2+9x-5=3（2x2+3x）-5

(1) C = 5 9 * (100-32) = Celsius, which can be reached by people with fever.

2) 2x squared + 3x-1=2, then 2x squared + 3x=3;The equal sign is multiplied by 3 at the same time, so the square of 6x + 9x = 9;9-5=4

There is such a problem in the fifth grade of elementary school mathematics.

100 degrees Fahrenheit is about degrees Celsius.

In the first question, substituting f=100 into the formula C is approximately equal to the human body temperature.

In the second question, because 2x2+3x-1=2, 2x2+3x=3, because 6x2+9x is 3 times that of 2x2+3x, so 6x2+9x=3*3=9, so 6x2+9x-5=9-5=4

This isn't a math problem!

Mom, ah, ah...

I can't even read it.

1.Solution: 3 divided by (1 3) = 9

8 divided by 9 = 8 9

Answer: You can enter 8 9, and there is 1 9 left to complete.

2.Solution: 240 times 3 4 = 180 (kg).

There are a total of x bags.

1/4 x=180

x=45A: 45 bags have been filled.

3.Solution: A 60-watt lamp consumes 3/50 kWh of electricity in 1 hour.

Last month's electricity consumption was 6 kWh.

So last month 6 (3 50) = 100 hours.

3 3 = 9 (hours).

8 9 = 8 out of 9.

1 - 8 out of 9 = 1 in 9.

Answer; Eight out of nine can be recorded, and one out of nine.

240 quarters = 960 bags.

960x three-quarters = 720 bags.

Answer; Packed 720 bags.

6 Three-tenths of a fiftieth = 100 hours.

A: 100 hours of use.

1.Let the original grain x block be 45% x for dairy grain, 55% x for fruit grain, and 45% x = (x + 16)*25%.

20% x =4

x=2020*45%=9 blocks.

2.Warehouse A has 5,400 tons of grain and warehouse B has 70 tons of grain, so how many tons of grain must be transported from warehouse B and put into warehouse A if the grain stored in warehouse A is 3 times that of warehouse B?

3.Since it is a round trip, the total distance up and down the mountain is the same as the one going down.

Let the total distance be x km, half of which is up the hill and half down the mountain.

x/2 / + x/2 / =5

x = km. 4.Let's say the distance he walks is x kilometers.

x/5 + 60-x)/18 =

x = 15 km.

It's serialized in the back, I can't read it.