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27÷（3+1）=6……3 (bottles) [Explain that you can buy 6 3 bottles, and then you can change 6 bottles, and there will be 3 bottles missing].

6 3 = 2 (bottles) [how many bottles can be exchanged for 6 bottles] 6 3 + 6 + 2 = 26 (bottles) [count how many bottles are there now for buying and changing] 27-26 = 1 (bottle) [Explain that there is still one bottle left, you need to buy another bottle] 6 3 + 1 = 19 (bottles) [Add up the 6 3 bottles you bought first and the 1 bottle you bought last, and calculate that you need to buy at least 19 bottles of drinks].

Hopefully, thank you

The number of people who started with the number of drinks bought as a result.

27 3 3 people drank it for 1

24 Buy 2 more and drink it for 3 people in exchange for 1

21 2 3 people drank it for 1

3。。。2 3 people drink in exchange for 1

Buy 19 bottles and 1 more bottle, if you can find someone to borrow 1 bottle first, you only need to buy 18 bottles.

The regular column formula is n 3=a + remainder b

The number of drinks to buy is c=3+2 (a-1)+b-1=2a+b(b≠0) or c=3+2 (a-1)=2a+1 (b=0).

If n=100, then 100 3=33 + remainder: 1 c=2, 33+1=67

4 people buy 3 bottles, they will give 1 bottle, which is equal to one bottle per person, and there is 1 empty bottle after drinking, 4 times 6 means that 24 people only use 3 times 6 bottles equals 18 bottles, and there are 6 empty bottles left after drinking.

6 empty bottles are equal to 2 full bottles, so 24 people can buy 18 bottles and drink 2 bottles for a total of 26 bottles, but there are 27 people who can only buy 1 more bottle, that is, a total of 19 bottles, but after drinking can also change 1 full bottle.

If each person wants to hold one bottle in their hand, they can only buy 27 bottles, so you can't wait for three people to drink it and change the bottle.

1.The starting fare of a taxi is 6 yuan (the average charge is 6 yuan for those within 2 kilometers), and the fee for more than 2 kilometers is charged per kilometer. Teacher Wang Danzhu took a taxi for 5/2 of a kilometer, and if he traveled more than 5 kilometers, he should pay 14 yuan.

2.A bag originally contained 10 safflowers, and then 15 white flowers. If you touch any one of them, the probability of touching a safflower is 40%.

3.Of the three inner angles of a right triangle, the degree of the smallest angle is one-fifth of the degree of the largest angle, and this smallest angle is (d).

A: 30° B: 60° C: 45° D: 18°

4.A cube with a flute length of 1 meter has a volume of 1 cubic meter. If you cut it into small cubes with a flute length of 1 cm, you can cut it into 1,000,000 of these small cubes. Arrange these small cubes in a row, and the length is 10,000 meters.

5.The installation network in the Shenghu Garden Community has been installed in 250 households, and 6 out of 11 have not been installed. How many residents are there in this community?

250 (1-6 11) = 550 households.

6.A rectangular fiberglass with a length of 8 decimeters, a width of 6 decimeters, a height of 4 decimeters, and a water depth of decimeters. If you put a cube of iron with a flute length of 4 decimeters, how many liters of water will overflow from the glass tank?

4*4*4-8*6*(L.)

Let the rabbit speed x kitten y, then:

4x+4y=40-4=36 (a)

40-5x=2*(40-5y) (b)

x=10/3,y=17/3

So the speed of a rabbit is 10 3 kmh and that of a kitten is 17 3 kmh.

After four hours, the distance was 4 kilometers.

If it is 4 kilometers in opposite directions, then in 4 hours, the two objects have traveled a total of 36 kilometers, and the sum speed of the two objects is 9 kilometers per hour.

After another hour, the two objects ran 45 kilometers, and the sum of the distance from each other was 2*40-45=35 kilometers.

It can be calculated that the rabbit is 70 3 km to place B, and the cat is 35 3 km to place A.

Rabbit speed (40-70 3) 5 = 10 3 km Hour cat speed (40-35 3) 5 = 17 3 km Hour If it is 4 km against each other, then a total of 44 km has been run, and the speed and 11 km h After one hour, the two things have run 55 km, and the distance from their respective ends is 2*40-55=25 km.

The rabbit is 50 3 km away from place B, and the cat is 25 3 km away from place A.

Rabbit speed 14-3 km/h.

Cat speed 19-3 km/h.

1. After 4 hours of 4 kilometers and 36 kilometers in 4 hours, the speed of the kitten and the rabbit is 9 km h

2. After another hour, you should walk another 9km, then the sum of the remaining distance between the rabbit and the kitten is, 40-(9*5-40)=35km, so the distance from the rabbit to place B is, 70 3, and the remaining distance from the kitten to place A is 35 3

The speed of the rabbit is: (40-70 3) 5, and the speed of the kitten is: (40-35 3) 5

There is also a possibility that the distance between the rabbit and the kitten after 4 hours is 4km after the rabbit and the kitten meet, if that is the case, the kitten and the rabbit traveled 44km in 4 hours, not 36km.

The sum of the speed of the rabbit and the kitten = (40-4) 4 = 9 km Hours 1 hour later, a total of 5 hours, they have walked a total of 5 9 = 45 km, then let the rabbit walk x km, then the kitten has walked 45-x km According to the title, 40-x=2(40-(45-x)) gives x=50 3, then 45-x=85 3

So the rabbit velocity is x 5 = 10 3 and the kitten is (45-x) 5 = 17 3

The barrel with oil weighs 12kg, and half of it is poured out, which is half of the oil left over and the barrel weighs 7kg, and the two are subtracted, which is actually the general oil cut off (half of the oil is poured out), so that it is obtained: 12-7=oil 2;So the oil weighs 10kg, the barrel weighs 2kg, if a kilogram of oil sells for yuan, it can be sold for yuan.

Vertical equation solution: let the total weight of oil be x and the barrel weight y;

x+y=12

x/2+y=7；x=10, y=2;That is, the oil weighs 10kg; The barrel weighs 2kg.

Solution: According to the binary equation of "the barrel weighs 12 kilograms" and "after pouring out half, the barrel weighs 7 kilograms".

Oil + barrel = 12

1 2 oil) + barrel = 7

Subtract the two formulas to obtain oil weighing 10kg and barrel weighing 2kg

10kg of oil sells for 86 yuan.

Set the oil weight x kg and the barrel weight y kg.

Column equation: x+y=12

So x=10 y=2

So this barrel of oil can be sold for 10* yuan.

12-7=5, 5 kg is the mass of half a barrel of oil, then the mass of a barrel of oil is 10 kg, one kilogram yuan, then 10 kg is 86 yuan.

Pour out half and leave 7 kg.

Oil weight = 2 * (12-7) = 10 kg.

This barrel of oil can be sold for 10* yuan.

Question 1: This barrel of oil has a total of: (12-7) 2=5 2=10 kilograms.

This barrel of oil can be bought: 10 yuan.

Solution: 12-7=5 for the first invert

And because 5 is half poured.

So the oil has a total of 10 kilograms.

It can be sold for 10* yuan.

Answer: It can be sold for 86 yuan.

Half the weight = 12-7 = 5 kg.

Then this barrel of oil = 5 * 2 = 10 kg.

Yuan, this barrel of oil can buy 86 yuan.

Pour out half of the 7 kilograms left, which means that half of the oil is 5 kilograms, and all the oil is 10 kilograms, so the barrel weighs 2 kilograms.

This barrel of oil can be sold for a total of yuan.

The oil weight p is 12-p=7-p 2 and p=10, so the oil can be bought for 86 yuan.

Proof: Connect AC, AD

Because ab=ae, bc=de, abc= aed, ac=ad

Because f is the cd midpoint again.

So af cd

Connect ac de abc congruence aed=》ac=ad

f is the midpoint. So af cd