second floor

20 14-02- 1 1 10: 1 1

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From the iPhone client

Helen: Change is too difficult. It's simpler. There is a string of peaches. Take out the (a- 1)/a of this pile of peaches and put it back b and c times, and there are still d peaches left. Find the original peach, where a, b, c and d are positive integers and a≠ 1.

2014-2-110:14 reply

Y2020u: Reply Heltion: I feel it is difficult for you to do this.

2014-2-110:15 reply

Heltion: reply y2020u: equivalent to defining the sequence {x[n]} where x[0]=d, x[n+ 1]=a(x[n]-b) and find x[c].

2014-2-110:18 reply

Y2020u: Reply Heltion: I want to say that I am a junior-

2014-2-110:19 reply

Your Majesty Mao: Reply to He Long: 34- No matter when and where, the sky above us is as far away as ever, just like a bond that can never be separated.

2014-2-110: 31reply

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Heltion

barkeeper

12

The hardest question is

Try asking:

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second floor[British English]; third floor[American English]

20 14-02- 1 1 10: 1 1

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y2020u

full member

five

Between 9: 00 and 10: 00 (), the minute hand and the minute hand are in a straight line.

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Fourth Floor

20 14-02- 1 1 10: 12

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Your Majesty Mao: I'm too lazy to count-whenever and wherever, there is the same distant sky above us, just like a bond that can never be separated.

2014-2-1110: 32 reply

The hour hand must be between 9 and 10, with 3 in a straight line with 9 and 4 in a straight line with 10, and the corresponding minute hand should be between 15-20; Then, the hour hand should be a little over a quarter of 9- 10, and a quarter of 15-20 is a little over 16.25. If the minute points to 16.5 minutes, the hour hand of the corresponding straight line is 9: 18, which has exceeded 16.

2014-2-111:37 reply.

Y2020u: Reply: A little after 16 o'clock.

2014-2-111:40 reply.

Brush grandma to save character: just make an equation, which is obviously a junior high school question.

2014-2-1112: 57 reply

Y2020u: reply to brush grandma's character: primary school. . I made it in my junior year.

2014-2-1113: 00 reply

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y2020u

full member

five

3. Simple operation: 2004 2004 * 2004 2003-2004 2005 * 2004 2002

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Fifth Floor

20 14-02- 1 1 10: 14

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Niu 88884: 2

2014-2-110: 31reply

20042004 * 20042002+20042004-20042004 * 20042002-20042002 = 20042004-20042002 = 2.

2014-2-111:45 reply.

cxs jxx:(20042003.5^2-0.5^2)-(20042003.5^2- 1.5^2)=2.25-0.25=2

2014-2-1113: 55 reply

Once _orz: Use letters instead of complex numbers.

2014-4-3016:13 reply

Neat and beautiful: 4*3-5*2

20 14-4-30 18:02 reply

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y2020u

full member

five

4. Using two kinds of fruit candy with the unit of 1 1 yuan per kilogram, the mixed fruit candy with the unit price of 8 yuan was prepared, and the mass ratio of these two kinds of candy was (): ().

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Sixth floor

20 14-02- 1 1 10: 18

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Cattle 88884: 3:2

2014-2-1110: 32 reply

??: ( 1 1-8): (8-6) = 3: 2.

2014-2-1112: 00 reply

Elegant Cat Sith: Wocao! Memories of elementary school! ! ! ! ! There is also the problem of mixing salt water! !

20 14-5- 17: 35 reply

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Chen 17

Core member

eight

Honey, it's no good being so arrogant in math bar. I suggest you exercise restraint.

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Seventh Floor

20 14-02- 1 1 10: 19

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Y2020u: that makes sense.

2014-2-110: 21reply

China: I like this expression.

2014-2-1110: 45 reply

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A relentless rumble

Core member

seven

Mobile phone sign-in experience +8 points, three times later entry experience+12 points, the whole process is less than five minutes, and the experience can be increased by 20 points every day. ...

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The eighth floor

20 14-02- 1 1 10: 19

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From Android client

y2020u

full member

five

5. The middle of a book (not necessarily a good middle) has been torn off, and the sum of the remaining page numbers is exactly 1200. How many pages of this book have been torn out () and ()?

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Ninth floor

20 14-02- 1 1 10:2 1

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Helen: This is more interesting. 50,37,38

2014-2-1110: 27 reply

Y2020u: Reply to Heltion:

2014-2-1110: 28 reply

では: n (n+1) = 2× (1200+2a+1) = 2400+4a+2, where n is the total number of pages (even number) and a is the page number (odd number) of the torn home page. Since 50×5 1=2550 and 48×49=2352, we can see that n=50 and a=37.

2014-2-112: 31reply

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y2020u

full member

five

6. A road is divided into three sections: uphill, flat and downhill, and the distance ratio of each section is 2:3:4 in turn. Obviously, the time ratio for completing these three sections is 4:5:6, and it is known that his uphill speed is 4 hours per hour. The total distance is 36 kilometers. How long does it take to complete the journey?

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10 building

20 14-02- 1 1 10:25

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Niu88884: 4 hours per hour uphill?

2014-2-1110: 43 reply

Y2020u: reply niu88884: km. Wrong number.

2014-2-1110: 46 reply

Niu88884: reply y2020u :7.5 hours.

2014-2-110: 51reply

Grazing: uphill road 2/(2+3+4) × 36 = 8km, walking for 8/4 = 2h, and total * * * walking for 2/4 × (4+5+6) = 7.5h. ..

2014-2-1112: 35 reply

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y2020u

full member

five

7. If the sum of the reciprocal of four different prime numbers is x/2002, what is X?

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1 1 building

20 14-02- 1 1 10:27

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Chen 17: this question is still interesting, prime factor decomposition.

2014-2-1110: 33 reply

A few degrees of maple red in the backlight: 2 7 1 1 13

2014-2-112:19 reply

のの:2002 = 2×7× 1 1× 13，x = 2+7+ 1 13。

2014-2-1112: 38 reply

Uh, there was a mistake. x = 2×7× 1 1+2×7× 13+2× 1 1×65438+。

2014-2-1112: 58 reply

Dreams are just dreams M: 1623

2014-2-1113: 45 reply

I also said.

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y2020u

full member

five

8. There are five Mondays in a month. But the first and last day of this month is not Monday. How many days are there in this month? What day is the first day?

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/kloc-building 0/2

20 14-02- 1 1 10:3 1

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Niu 88884: 3 1, Monday.

2014-2-1110: 40 reply

〕〕: 4× 7+ 1+ 1 = 3 1.

2014-2-1112: 40 reply

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y2020u

full member

five

9. The lengths of the three sides of a right triangle are 26 cm, 24 26 cm and 24 cm 10 cm respectively, and the height of the hypotenuse is

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/kloc-building 0/3

20 14-02- 1 1 10:37

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Niu88884: Basic

2014-2-1110: 38 reply

24× 10/26

2014-2-112: 41reply

Dreams are just dreams M: 120/ 13

2014-2-1113: 49 reply

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y2020u

full member

five

10. Is the known square area 16cm? Find the area of the shaded part.

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14th floor

20 14-02- 1 1 10:4 1

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Cattle 88884: 2π

2014-2-1110: 47 reply

36635 18: Reply to Niu 88884 :8π! ! ! !

2014-2-1110: 54 reply

Niu 88884: Reply 36635 18: Do you think the square is big or small?

2014-2-1110: 59 reply

Y2020u: Reply to niu88884: It's the Grand Plaza.

2014-2-11:01reply.

36635 18: reply y2020u: that's 2π.

2014-2-11:1/reply.

I also said.

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y2020u

full member

five

1 1. Mix 100g of 20% salt solution with 200g of 10% salt solution, pour out 100g, and then add 100g of water. What is the concentration of the new salt solution?

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15 building

20 14-02- 1 1 10:45

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Concentration after the first mixing: (100× 0.2+200× 0.1)/(100+200) = 2/15, * * 15.

2014-2-112: 51reply

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y2020u

full member

five

12. It takes 26 seconds for the train to cross a 396m bridge. It takes 18 seconds to pass through a 252-meter tunnel at the same speed. How long is this train?

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/kloc-building 0/6

20 14-02- 1 1 10:48

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Train speed: (396-252)/(26-18) =18m/s, length: 18×26-396 or 18× 18-256.

2014-2-1112: 55 reply

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Niu 88884

Core member

eight

Is this an Olympic math problem?

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/kloc-building 0/7

20 14-02- 1 1 10:49

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Y2020u: Not for you, of course.

2014-2-1110: 52 reply

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y2020u

full member

five

Do you feel sorry for me if I have to do such a topic after I finish primary school and go to junior high school?

answer

/kloc-building 0/8

20 14-02- 1 1 10:5 1

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Niu 88884

Core member

eight

I remember that there was a scale problem in the sixth grade of primary school when making up the Olympic math.

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/kloc-building 0/9

20 14-02- 1 1 10:52

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Y2020u: I haven't learned it.

2014-2-1110: 53 reply

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y2020u

full member

five

The answer to the first question is 34.

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20th floor

20 14-02- 1 1 10:56

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y2020u

full member

five

The answer to the second question is 9: 00164/11.

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2 1 building

20 14-02- 1 1 10:57

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Lin Xiaosen, a match seller: In another case,11returns at 9: 49, which is also a straight line.

2014-2-111:45 reply.

Y2020u: Reply to Lin Xiaosen who sells matches: That's right.

2014-2-111:46 reply.

I also said.

y2020u

full member

five

Answer 2 to the third question

The answer to the fourth question is 3:2.

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22nd floor

20 14-02- 1 1 10:58

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y2020u

full member

five

The answer to the seventh question is 1623.

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23rd floor

20 14-02- 1 1 10:59

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A few degrees against the light: I doubt it. What is this thing?

2014-2-1112: 21reply

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y2020u

full member

five

The answer to the ninth question is 120/ 13 cm.

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24th floor

20 14-02- 1 1 1 1:00

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y2020u

full member

five

The answer to the tenth question is 12.56.

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25th floor

20 14-02- 1 1 1 1:0 1

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Niu88884: There is a problem with the answer.

2014-2-111:06 reply.

Y2020u: Reply to niu88884: Forgot to divide by two.

2014-2-111:36 reply.

Y2020u: It should be 6.28.

2014-2-111:37 reply.

Penrose_: reply y2020u: no wonder.

2014-2-1113: 04 reply

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y2020u

full member

five

The eleventh answer is about 8.9%.

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26th floor

20 14-02- 1 1 1 1:02

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y2020u

full member

five

The answer to the question 12 is 72m.

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27th floor

20 14-02- 1 1 1 1:03

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y2020u

full member

five

The most difficult answer is actually that the answer on TV is 67004 17. I don't know if it is accurate.

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28th floor

20 14-02- 1 1 1 1:05

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N_a_O_H_: 67004 17？ It is a factor of 4294967297.

2014-2-111:39 reply.

Y2020u: Reply N_a_O_H_: I don't know if I did this topic by watching TV.

2014-2-11:41reply.

Penrose_: Reply y2020u: Find the steps to solve the problem.

2014-2-1113: 05 reply

Y2020u: Reply to Penrose_: There is only one answer. Isn't there any money to know the source of the topic?

2014-2-1113: 07 reply

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Niu 88884

Core member

eight

s = 1/( 1/ 1980+ 1/ 1+ 1/ 1982+...+ 1/.

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29th floor

20 14-02- 1 1 1 1: 16

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Y2020u: No, I haven't learned to guess the integer part of the question yet.

2014-2-111:44 reply.

Niu88884: reply y2020u: zoom method, and the final answer is 165.

2014-2-111:54 reply.

I also said.

It rains in Sishui every year.

celebrity

10

I thought it was normal. Similar problems seem to have been done before. .

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30th floor

20 14-02- 1 1 1 1:32

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From Android client

Y2020u: It's really a bitter and sour tear. I want to be admitted to No.1 Middle School, and I am 0.5 points short.

2014-2-111:43 reply.

Time flies: reply y2020u: what is junior high school? High school is the key.

2014-2-111:45 reply.

Lin Xiaosen, a match seller: High school is nothing, but college is the key.

2014-2-111:54 reply.

Niu88884: Reply to match seller Lin Xiaosen: There is nothing wrong with the university, but the problem of 7,000 years is the key.

2014-2-1112: 05 reply

Lin Xiaosen, a match seller: Reply to Niu 88884: Don't be ridiculous. In fact, it is not easy for the landlord.