Super difficult math problems for the first year of junior high school, the most difficult math prob

The cost is $10,000.

Then from the meaning of the title:

x+5）*（1+

x+5)* solution is approximately equal to 44

When x is less than 44, the markdown sales are unfavorable.

When x is greater than 440,000, it is beneficial to sell at a reduced price.

The rest of the self-organized language must be related to the cost.

Set the cost to x to reduce the price and sell (x+5) million yuan.

Year-end sales (x + 10,000 yuan.

Invest separately (x+5).

If it is advantageous to invest the principal and interest separately.

x+5).

x So it is advantageous when the cost is greater than 10,000.

The answer is related to the cost of this batch of clothing, when the cost is less than 4.85 million, the manager's decision is unprofitable, when the cost is greater than 4.85 million, the manager's decision is favorable, and when the cost is equal to 4.85 million, the benefits of both are the same.

Assuming the cost is x, the manager's approach can be profitable. Save it for the year-end profit.

Calculate the value that gives x.

Then the answer to this question is that if the cost is greater than the last value of x, then it will be sold out immediately and the profit will be the most. If the cost is less than the value of x, the profit will be more at the end of the year.

Set the cost to be X0,000, and leave it for the year-end sales to make a profit of 10,000 yuan.

Dispose of the available profit as soon as possible (5+x)*10,000 yuan.

When (5+x)*10,000 yuan, the solution is obtained, x = 10,000 yuan.

That is, when the cost is greater than 10,000 yuan, it is more profitable to sell as soon as possible; When the cost is less than 10,000 yuan, the profit left for sales at the end of the year is greater.

Don't explain? Selling as soon as possible is advantageous and cost-related.

If you want to explain, I will add another question.

I have a similar problem in the Primary School Olympiad in the first year of junior high school, and I want to tell you in a few days! Ask the Olympiad genius in our class.

You don't have to forget if you die!

Knowing that x is divided by 3 and left 2, and divided by 4 and left 1, the minimum value of x is found.

Isosceles triangle ABC, AB AC, angle a 20 degrees.

Point D on AB and AD BC. Nexus CD.

Find the degree of angular ACD.

Judgment method: 1. Acute triangle: The three inner angles of the triangle are less than 90 degrees.

2. Right triangle: one of the three inner angles of the triangle is equal to 90 degrees, which can be recorded as RT.

3. Obtuse triangle: One of the three inner angles of the triangle is greater than 90 degrees.

According to relevant data, an average of 8,000 people die every day from smoking-related diseases worldwide. There are about 300 million smokers in China, accounting for a quarter of the world's smokers. Comparing the number of people who die from smoking-related diseases as a percentage of the total number of smokers in a year, our country is higher than the rest of the world.

1) Based on the above information, try the binary system of equations to find out what is the number of people who die from smoking-related diseases in China and other countries in the world in a year.

2) from the press. Books. The network and so on collect some data, analyze the quantitative relationship, and compile questions. Let's see if we can solve these styles with a system of binary equations.

Isosceles triangle ABC, AB AC, angle a 20 degrees.

Point D on AB and AD BC. Nexus CD.

Find the degree of angular ACD.

Knowing that x is divided by 3 and left 2, and divided by 4 and left 1, the minimum value of x is found.

A toy factory has four workshops, and now each workshop has the original A(A>0) finished products, and each workshop produces B(B>0) finished products every day, and the quality inspection department sends a number of inspectors in the week.

1. Tuesday to inspect all the finished products in two of the workshops and those produced in these two days, and then Wednesday to Friday to inspect the original finished products in the other two workshops and all the finished products produced during the week, assuming that each inspector inspects the same number of finished products per day.

1) How many finished products does these inspectors inspect in a day? (expressed by an algebraic formula containing a and b) (2) try to find the relation that represents a with b;

3) If 1 inspector can inspect three-fifths of B products in a day, how many inspectors should be sent by the quality inspection department at least?

Set the distance x

x (40 + 50) - x (45 + 50) = 1 6x (45 + 50) = time taken for B and C to meet.

x (40+50) = the time taken by A and B to meet.

1 6 = 10 minutes.

Let the distance between cities A and B be s, and car C meets car B t hours s = (45 + 50) t = (40 + 50) (t + 10 60) 95t = 90t + 15

t=3s=(45+50)t=95*3=285km.

Set the time to x

According to the problem, 45x+50x=40(x+1 6)+50(x+1 6) is solved x=3

Let the distance between cities A and B be x and the time taken for car B and car C to meet is t minutes 45t + 50t = x

40（t + 10） +50 （t + 10）= x→t=?Then bring t into the above formula.

Let the distance between the two places be s, and the time it takes for B and C to meet is t

45t+50t=s

40 (t + 1 6) + 50 (t + 1 6) = s to obtain s = 285 km.

1、=1；=-1

2、；（m+n）²=1

times, 1028 roots.

Explanation: 1. The result of even power is positive; When the base number is negative, the odd power is negative. 2n is an even number; 2n+1 is an odd number;

2、|m-n|=n-m, so there must be n greater than m, according to |m|=4 ，|n|=3, only m=-4, when n=3 n is greater than m, then it can be obtained;

3. The first kneading is 2, and each subsequent kneading is increased by 1 times, that is, with 2 as the base, the power increases; then the power of 2 to the power of 7 is 128; The power of 2 to the power of 10 is 1028;

is a positive integer, then 2 times (-1) n square = 1

1) 2 times n plus 1 square = -1

2.The topic is incomplete, please add.

3.2 times every time?

The 5th power of 2 is 128, which is the 6th time.

The 10th time is 2 to the 9th power 2048?

You can try the method of doubling the length of the midline.

Let's learn the three-line octagonal first, this is the basic.

Regularity: Every 4 digits in a cycle.

2.Since 2008-4 = 2004 = 0 (mod 4), the single digit of 3 2008 is the same as the single digit of 3 4, so 3 2008-3 4 is a multiple of 10.

3 9 7 1 cycle.

2008 divisible by 4 single digits is 1

4 divisible divided by 4 single digits is 1

So 3 2008-3 4 has a single digit of 0 which is a multiple of 10.