How do you calculate that a math problem is an infinitesimal number?

Solution: Let the original investment funds be x yuan and y yuan respectively.

Rule. x*(1-20%)=2000

y*(1+20%)=2000

x=2500,y=5000/3

So the loss of 2500 + 5000 3-2000-2000 = 500 3 is an infinite decimal. Take three decimal places.

is an infinite decimal.

Earned 20% of the capital: 2000 (1+20%) = yuan.

Lost 20% of the capital: 2000 (1-20%)=2500 yuan.

So it's a loss, it's a loss.

The kind that earns 20% of the money, the cost is: 2000 (1+20%) = 5000 3 yuan.

The cost of the loss of 20% is: 2000 (1-20%) = 2500 yuan.

Earned in total: 2000 2-5000 3-2500 = -500 3 yuan.

So the loss of 500 3 yuan is indeed an infinite loop decimal place.

2000 yuan is the original price of earning.

2000 yuan is the original price of the loss.

The total profit and loss is RMB.

Earned dollars. Infinitesimal decimals are normal.

Xiao Ming's mother usually does ** trading, and his mother recently threw out 2 kinds of **, one of which earned 20, and the other lost 20, and his mother asked Xiao Ming to help him calculate whether he made or lost? Or is it not to make or lose? If so, how much money did you make or lose?

Let's say the money is the same as the sale. The money for the sale is the unit "1".

The cost of earning is: 1 [1+20%]=, earned:. 17 The cost of loss is: 1 [1-20%] = , loss: . 25 And it can be seen that it is a loss, a loss: [. 08 units.

Solution: Let this two decimal places be x

100x-x=

99x=x=A: This two decimal places are.

Be sure to give points!

If you set it to x with two decimal places, it will become 100x if you forget the decimal point.

99x= x=

Algebraic solution: Let this decimal be x, then the decimal point becomes 100x after the decimal point is written incorrectly, so 100x x

Arithmetic solution: Forgetting the decimal point is equivalent to magnifying the number by 100 times, and actually increasing it by 99 times, so this number is equal to.

It's a problem, it's hard to die、、、

Set to x. If you forget the decimal point, it becomes 100x.

According to the title, 99x=

The solution is x=

Since it is two decimal places, I forgot that the difference between the decimal point is 100 times, and the ratio to the original is -1

After about the simplest number of pure wheels, make a mountain.

Only fractions with denominator can be reduced to finite decimals, e.g. 1 2, 3 5, 7 25, 3 75, 11 150, ,......

In addition to , the denominator also has its prime factor, which is an infinitesimal decimal.

Such as: 1 3, 1 12, 1 15, ,......

To be precise, 1 = infinite loop, which was discussed in the first class of mathematical analysis at university.

Infinite loop*3 is meaningful, infinite loop*3 = loop = 1

If x=a is a positive integer, then x=(a-1)99999……

27 questions, I used the Lobida rule twice, and the result of the calculation is only one possibility, that is, a=1 2, b=-1 2, which can be communicated together.

Uh, I'm late, I'm busy. This kind of question, just choose one number of times, you can count it orally, don't panic.

The number multiplied is equal to ......

Question incomplete.

5×57×

Division: 210

15 (the easy way to circulate decimals, except for 2 decimal places):

Set: The price of the product is X yuan.

x-650)-(85\100)x=250x=6000

A: The price of the product is 6,000 yuan.

The set price is $x.

x-650=85%x+250

Solve the equation to obtain: x=6000 yuan.