Another math problem, there is such a math problem

Obviously, the younger brother is twice as fast as the older brother.

Let the elder brother's velocity be v, and the younger brother's velocity is.

Combining the two processes, it should be that when the younger brother runs 100 meters, the elder brother should run 100+l, according to the equal time of the two people, the agenda is as follows:

100+l)/v=100/

It is not difficult to solve that l=, rounded to l=

That is: the elder brother stepped back and started, and the two arrived at the same time.

Solution: According to: v s t, t is the same, v is proportional to s, so the velocity ratio of the elder brother to the younger brother is 100 94, assuming that the elder brother retreats x meters, then the equation gets: (100+x) 100 100 94, and the solution gets: x

Answer: To make both of them arrive at the same time, the elder brother should step back.

Suppose the elder brother goes back x meters, and the column equation: 100 94=(100+x) 100

x=10000/94-100x=

100+x)/100/t=100/94/t

Explanation: Let the first run take time t, then the elder brother's speed is 100 t, the younger brother's is 94 t, and then let the second run brother step back x, the column equation can be, where t can be eliminated!!

Promise yes, find me if it's wrong!!

From the first run, it can be seen that the time of the two is the same, and the distance of the two is 100 and 94, and the auxiliary unknown time t. is setThen set the back x meters, and the equation can be listed, and the equivalent relationship is that the time of the two people is equal.

First of all, x is the growth rate, then that is, multiply the base by x to get the part of the growth, then multiply the base by (1+x) is the total amount of growth.

So, there may be some problems with the explanation in your title, and according to the definition of growth rate, the following statement is correct:

It is the first year of the liter **;

It is the first year after the promotion;

It is the second year of the liter **;

It is the ** after the second year of promotion.

I don't know if this explanation is clear, but if in doubt, I will continue to explain.

Just give me a bounty and I'll tell you!!

What chicken eggs, what era is it? What a good student! You're too uninspired.

To put it bluntly, you're out.

When a<0 y increases with x.

When a is greater than 0, y decreases as x increases.

The function y=kx+b when k 0 y increases with x and decreases when k 0 y decreases with x (formula).

The principal is unit one, 1 principal plus interest Is this your formula? Because the principal plus interest is 22646 yuan, which is 1+ of the principal, it is used 22646 [(1+ yuan, by the way, 3 is because of the 3-year term, do you understand?) Come on, do a few more questions, read my train of thought, don't think about the answer, think why are you wrong?

Let's do it!!

A sells 780 + 100 = 880 tons of coal, and the payment is 10,000 yuan. The average price is yuan tons.

B sells 364 tons of coal hood mold for 10,000 yuan, with an average price of 10,000 tons.

C sold 462 tons of coal for 10,000 yuan, with an average price of 10,000 tons.

Obviously, the three people have different selling prices and make profits, so in order to fairly distribute the benefits, it is recommended.