Magical math problem, a magical math problem, ask the great god

The first time we met, it was a total of 1 A and B two stops away.

The second encounter was a total of 3 A and B stops away.

A1-35

B1 65

The speed ratio is 135/

The first encounter was 90 km from station A.

90 km.

Assuming that the first encounter takes time t, the ab distance is x

Then the total distance of A and B is ab distance x

The total distance traveled for the second encounter is 3 times the ab distance 3x

A travels 90 kilometers in time t.

A total of 90*3=270 kilometers can be exercised within 3t.

A travels a total distance of x+(1-65%)x

i.e. x + (1-65%) x = 270 km.

x = 200 km.

Let the velocity of A be v A, the velocity of B be v B, and the distance between ab is xThen according to the title:

v A v B =

v A v B = 90 (x-90)...2

Substituting 1 into 2 obtains: 90 * solution x = 20 (km).

A: The distance between stations A and B is 20 kilometers.

The answer is 200km

The steps are as follows: set the distance between stations A and B to be x km, the speed of A is v1, and the speed of B is v2

For the first encounter, the distance traveled by A is 90, the distance traveled by B x-90 lists the equation 90 v1 = (x-90) v2 the second encounter, the distance traveled by A x+, the distance traveled by B x+ lists the equation (x+ = (x+

The two formulas are compared up and down, and they are obtained.

90/(x+ (x-90)/(x+

Calculated as x=200

Let the first encounter time be t1 and the second encounter time t2, the total distance is s, and the sum of the velocities of A and B is v, and the following is obtained

s v=t1 3s v=t2 gives t2=3t1, so we can know that the total stroke of A is 90x3=270m

Next, according to the stroke of A, it is obtained: 2*(270-s)+65%s=s, obtain; s=

What are the conditions for the equal sign to be true for m +n 0? is m=n=0 which contradicts m+n=1, so the equal sign is not true. The maximum value is not.

This is a problem caused by logical fraud, what you say is 490 + 490 = 980, which refers to the total amount of money owed to the parents, and 1000 refers to the total amount of money owed to the parents.

And if you return your 10 yuan to either parent, then the total amount of money owed to your parents will become 980-10=970, which is exactly equal to the ** of the shoes, and if you return the shoes to your parents, you don't owe each other in value.

Therefore, 980-10 is meaningful, and the result of 980 + 10 is meaningless at all, if someone asks you 10 yuan to go to **, you ask others what the number of 980 + 10 means on the line, the other party will definitely not answer.

First took a total of 1000, and the remaining 30.

This is a misleading question, this question seems like this at first glance, but in fact, if it is 490+490+10, it is a stealing concept.

If you think about it this way, what did you do with the money you borrowed from your parents, did you buy shoes, then the money for the shoes and the money in your hand together are 1000If you divide the remaining 30 and give 10 to each of your parents.

It is equivalent to 490 you owe each of your parents, which is 980, and the sum of this 980 is 10 yuan in your hand and the money for shoes. So there is no difference of 10 yuan.

When the sum of two numbers is a constant, then the maximum of their product is the product of half of this constant.

For example, if the sum of two numbers = 10, then, 1 9 = 9;2×8=16；3×7=21；4×6=24；5×5=25；

6 4 = 24 (repeated) ......It can be seen that when 5 = 5 = 1 2, their product = 25 is the largest.

So, if m+n=1, then when m=n=1 2, the maximum value of mn = (1 2) = 1 4

Because your friend's method is not magical at all, and it is on the go!

Since m+n=1

It can be seen from thisIt is not possible to have m=0 and n=0Therefore m +n > 0, not 0So your friend's method has been asking for a weakening proposition for a long time.

By the way, the best practice for this question is to use the mean, and the result of 1 4 is correct.

Intelligence questions, IQ test. How many squares are there?

16 + 9 + 4 + 5 + 5 + 1 = 40 (pcs).

Quiz everyone: This is a math problem that can measure whether a person has business acumen. Master Wang is selling fish, a pound of fish at a price of 45 yuan, now a big sale at a loss, the customer bought a kilogram for 35 yuan, gave Master Wang 100 yuan fake money, Master Wang has no change, so he asked a neighbor for 100 yuan.

Afterwards, the neighbor found out that the money was fake in the process of depositing money, and it was confiscated by the bank, and Master Wang lost 100 yuan to the neighbor, how much did Master Wang lose in total?

Note: The difference between catties and kilograms.

A total loss of 100 + (45 2-35) = 100 + 55 = 155 yuan.

This is a misunderstanding, think about it, count these three people as a person, they all paid you back three yuan, and you paid 27 yuan, but you should pay 25 yuan, those two pieces were stolen by the waiter, how can it be 27 + 2, it should be 27-2 = 25, this is the money you should pay, in other words, you are a customer, you don't know that the waiter stole two dollars, only know that you paid a total of 27 yuan (those three dollars are paid back to you, and it has nothing to do with this question), The two dollars stolen by the waiter will definitely not let you know, it must have been stolen from your 27 dollars, how can it be added to 27!

This question started to confuse me, so I'll give it a go!

The three of them each took one yuan, a total of three yuan, 2 yuan at the waiter, and 25 yuan at the boss, a total of 30 yuan.

The above algorithm is here to confuse others.

In fact, the two yuan is subtracted, which should be 27-2 = 25 (yuan).

It's the money that should be paid, and it makes no sense to add two dollars.

The final payment of the trio was not 27, but 28Why, because during the preferential period, it is only 25 yuan, plus 3 yuan for refund, a total of 28, plus 2 yuan stolen by the waiter, a total of 30 yuan.

What is the era, there are still such old problems, and there are ...... math problemsDude, you're really bumpy.

The boss there, the waiter is 2 yuan, 1 yuan per person, and the boss is 25 yuan, just 30

In fact, she complicates your thoughts, 25 yuan plus 2 yuan for the waiter is 27 yuan, plus three yuan for three passengers is exactly 30 yuan.