About first increase the price and reduce the price , and then then reduce the price and increase

The original price x, first increase the original a%, then reduce the original b%, and finally ** is x(1+a%)(1-b%) First reduce the original a%, then increase the original b%, and finally ** is x(1-a%)(1+b%) Subtract the two to obtain: x(1+a%)(1-b%)-x(1-a%)(1+b%)=x[1+a%-b%-a%*b%-(1-a%+b%-a%*b%)]=x(2a%-2b%) i.e. a>b, The first rise and then the fall is higher than the first fall and then the rise**, a=b, the first rise and then the same as the first drop and then the rise**, aWhen

Whether it is a price increase first and then a price reduction or a price reduction and then a price increase, the final selling price is always lower than the original price Set the original price is 1, the price increase is a%, and then the price is reduced by a%.

The final selling price is: 1 (1+a%) 1-a%)=1-(a 100)%<1 Similarly, the price reduction is a%, and then the price is increased by a%, and the final selling price is also: 1-(a 100)%.

There is an axiom in mathematics that is not written in books, and it goes like this:

There are two positive numbers A and B, how do you determine that the product of these two numbers is the largest?

As a result, when a = b, or the difference between a and b is the smallest, the product is the largest. (You can attest), with the method of the second floor.

Using this axiom, you can think that A and B are the ratios of ** to the original ** before and after the price increase, respectively.

Thus, it is concluded that the price increase and price reduction range are the smallest, the product of AB is the largest, and the highest is the highest.

Where there are price increases and price reductions, the final ** will be reduced.

If, your family's **, you don't have to think about it to know.

When the stock price goes up 10% on the first day and falls 10% on the second day, you know you're losing money because the stock price has changed in the past two days.

The final price of the commodity is rising, and the price of the Dongfeng is 2%, and the original price can be regarded as 1, then after the price is reduced, the price will rise by 20%, so the price will rise by 2%.

Summary. A commodity first rose in price by 30% and then reduced by 40%, and now the ** is down, and the change is 22% less. The specific process will be sent by the teacher later**.

A commodity first rises in price by 30% and then drops in price by 40%, and now the ** is up or down, what is the change range?

Refund. A commodity first rose by 30% and then reduced by 40%, and now the ** is reduced, and the change in the slag town is 22% less. Specifically, Liang Bicheng waited for the teacher to send **.

What's wrong with the kids?

We're answering questions by hand.

First of all, the true/false question type is four operation questions of commodity **. Secondly, read the logic between observational numbers. Then, list the formulas, and then observe whether the decomposition or brother messes with the lead to split and exchange whether the formulas can be easily calculated.

In the end, according to the four algorithms, the answer is that it has decreased, and the amplitude is 22%.

The core breakthrough of this question is to treat the original price as a unit 1.

Do you return the money.

The rules of the four operations of the expansion and dismantling of the Zhaozhan (later comprehensive calculation) 1In the equation without parentheses, if there is only addition and subtraction or only multiplication and division, it must be calculated in order from left to right. 2.

In equations without parentheses, where there are both multiplication and division, addition and subtraction, multiplication and division must be calculated first, and then addition and subtraction. 3.There are parentheses in the calculation of the rent type, and the inside of the brackets should be counted first, and then the outside of the brackets should be calculated, and the calculation order of large, medium and small parentheses is small, medium and large.

When a workshop gave the task of processing a batch of parts to methyl and B at 4:3 to complete the task, A actually processed 400 4800 parts, and Bo Chenchun exceeded 20% of the tasks assigned by Brother San's original plan, how many parts were there in total?

When a workshop gave a sock stool to A and B according to 4:3 to complete the task, A actually processed 4,800 parts, more than 20% of the original plan to allocate slag and trembling, and this batch of parts totaled 7,000.

A thing, the price is reduced by 1 5, and the price is increased by 20%, ask how much the increase (decrease)?

Hello, down 4%. The original game is 1, and after the price reduction, it is 1 (1-1 5)=. After the macro judgment of the price increase, it is equivalent to a drop (. I hope my reply can help you <>

After A goes to 1 5, the remaining 1 4 meters, find the full length?

Hello, please send the complete question here, don't abbreviate the conditions, which may affect the overall calculation <>

That's the whole question!

Hello, please take a picture of the original question, I'll confirm the answer here. The calculation is 1 4 (1-1 5) = 1 4 4 5 = 1 4 5 = 1 4 5 4 = 5 16 meters <>

Hello, I probably understand that this question is modeled on that kind of classical Chinese, so this answer is correct. <>

The 60 of 4 meters is the same as the () of 12 meters.

How do I figure it out is 5 12 (4 60).

Hello, (4, you calculated the <> backwards

Suppose the original price of the product is Y yuan:

Option 1: y(1+20%)(1-20%)=RMB.

Option 2: y(1-20%)(1+20%)=RMB.

That is, it is a lack of hunger and other pretends.

[1-(1-20%)x(1-20%)]1-20%)x(1-20%)]=

The original price is "1".

The current price is (1-20%) x (1-20%)

The original price is 1-(1-20%) x (1-20%) higher than the current price** is the current price [1-(1-20%) x (1-20%)] x (1-20%)] = of the current price

The current price is (1-20%) of the original price (1-20%) = 64%.

The current price is 1-64% lower than the original price = 36%.

The current price needs **(1-64%) 64%= to return to the original**.

The price of 1 1 20 1 20 36 is 36 percent lower than the original price

**% of the current price to return to the original price.