(2) 100 gold is divided by 1 yuan per catty, instead of 100 catty and 100 quick money, that is to say, 50 jins of scallion will be sold in 50 yuan. If you want to sell 50 kilos of green, 50 yuan will sell 1 yuan a kilo. That is to say, when trading, it was (50*7)+(50*3), but actually it should be (50+50)*(7+3), and the result was half.
(3) 65,438+000 gold is divided by 65,438+0 yuan per catty, instead of 65,438+000 jins and 65,438+000 quick money, that is to say, 50 jins of onions will be sold in 50 yuan. If you want to sell 50 kilos of green, 50 yuan will sell 1 yuan a kilo. That is to say, when trading, it was (50*7)+(50*3), but actually it should be (50+50)*(7+3), and the result was half.
(4) 1 yuan to buy 10, and eat the rest 10.
Change three more peaches and eat the remaining four stones.
Change 1 peach, and there are 2 stones left after eating.
There are/kloc-0 peaches on credit, and there are still 3 stones left after eating.
Give all the cores to the peach seller and the credit.
So, you ate10+3+1+1=15 peaches.
(5) Suppose that the ball with different mass from the other eleven balls is a ball, and its mass is greater than (or less than) the other eleven balls.
Firstly, divide the 12 ball into two groups (6 balls in each group), and put the balance on the tray respectively, with the A ball on the heavy (or light) side; Then divide the six balls into two groups (three in each group) and put them on the tray respectively, and put the heavy (or light) ball A on the other side. Then put any two of the three balls on the tray respectively, and record the mass relationship, and then exchange the other ball with the ball on the tray and record the mass relationship. Then exchange the replaced ball for another ball on the tray and write down the relationship between quality and size.
There is a mathematical relationship between the results, which can be obtained. .......
(6) The first 1 time is 334km, the third car is 3000-334*5= 1330, and the second loading and unloading place of the second car is 833km1330-(833-334) * 3 =-1. I don't know the positive solution. I'll figure it out for you later. There should be 533.
Let's take a kilometer as a unit. We'll leave when there are 2,000 left, 1, 000/5 = 200 kilometers, and when there are 1, 000/3 = 333 kilometers, we'll leave 1.
(7)
Suppose everyone gets y coconuts for the last time.
So, the number of coconuts picked at the beginning is:
で{(5y+ 1)×5÷4+ 1÷5÷4+ 1 }×5÷4+ 1÷5÷4+ 1
The solution method is15625y ÷1024+3125 ÷1024+625 ÷ 256+125 ÷ 64+. .
The second solution is:15625 y÷1024+3125÷1024+2500÷1024.
The answer is: (15625 y+1kloc-0/529) ÷1024 coconut.
As long as the number "(15625y+1kloc-0/529) ÷1024" is a positive integer, that is the correct answer.
So, what exactly is Y to make the number "(15625Y+11529) ÷1024" a positive integer?
By decomposing (15625y+1529) ÷1024, we can get (15,2587890625y+1kloc-0/,258774).
We can know that1-0,2587890625 = 0,741209375. Then, it means that if the numbers 15 and 2587890625 are added several times in succession, if the number after the decimal point just becomes 74 1209375, then the number of times of addition is y.
Coincidentally, if 15 and 2587890625 are added to get the multiple of 1023 (or 1024 minus the multiple of 1, such as 2047,30714095), the decimal point will be.
So the total number of coconuts is at least: (15625 y+1529) ÷1024 = (15625×1023+165438+.
In other words, there are at least 1562 1 leaf on the coconut tree.
(8) Ask the islanders' ① Aren't you an islander?' It can be concluded that what he just said is true or false.
Ask China islanders again (2) Is what that person just said untrue? You can know that raising X's hand means "yes".
Ask the big islanders again, is the treasure on the mountain (below)? "Raise your hand to 1 and then ask China islanders' (4) Is that man telling the truth just now? You can tell the location of the treasure by raising your hand and telling the truth and falsehood of China Islanders. & lt If 1 is X and X is selected in the middle, it proves that the treasure is telling the truth, that is, the treasure is on the mountain (below); If you don't choose X in the middle, it is deceptive, that is, the treasure is on the mountain (above); And vice versa, Dallas to the auditorium & gt
That is, ask where the treasure is with four questions.
(9)
1. (number of people+1) can be divisible by 3, 5, 7 and 9, so (number of people+1) is the common multiple of 3, 5, 7 and 9, and their minimum common multiple is 3 15, so the number of people should be 3/kloc.
Number of people =3 15×n- 1
You can know from the last sentence that the number of people can be divisible by 1 1.
So you can try a multiple of 3 15 to meet this condition:
3 15- 1=3 14 is not divisible by 1 1.
3 15×2- 1=629 is not divisible by 1 1.
3 15×3- 1=944 is not divisible by 1 1.
……
3 15×8- 1=25 19 25 19÷ 1 1=229
So the minimum number of people is 25 19. If everyone can sit down, the table is 25 19/3+ 1, which is 840.
2.。 . . . . .
(Du Niang is wise)