About the application problems of rational numbers in junior high school, the application problems o

The most standard is the No. 4 ball The absolute value is the smallest 6 The smaller the absolute value, the more standard It can be solved with the idea of a function If the other findings The absolute value is greater than the No. 4 ball Defined on the number axis, the distance from the point to the origin of a number is called the absolute value of the number, and the absolute value is " |to represent. On the number line, the value that represents the distance between a point of number a and the point of number b is called the absolute value of a-b and is denoted as |a-b|。The meaning of geometry is on the number axis, and the distance from a number to the origin is called the absolute value of the number e.g.

5 refers to the distance from the point of number 5 to the origin point on the number line, and this distance is 5, so the absolute value of 5 is 5. Meaning of algebra Non-negative numbers The absolute value of a positive number and 0 is itself, and the absolute value of a negative number and 0 is its opposite. The absolute value of a is given by "|".a |" means read as "the absolute value of a".

The absolute value of the real number a is always a non-negative number, i.e. |a |≥0。The absolute values of two numbers that are opposite to each other are equal, i.e., |-a|=|a|(because they are at equal distances from the origin on the number axis). If a is positive, then the |x|x of =a has two values a, such as |x|=3, then x= 3

It's a bit silly downstairs...I guess it's a mistake.

Their absolute values are:

Ball 1, Ball 2, Ball 3, Ball 4, Ball 5, Ball 6.

The closest thing to the standard, that is, the absolute smallest, is the size 3 ball.

Number 4. Calculate the absolute value of each ball, and the number closest to 0 is the closest ball to the standard.

1 Known 1+2+3+....+31+32+33==17 33, find 1-3+2-6+3-9+4-12+....+31-93+32-96+33-99.

2 in numbers 1, 2, 3,..., 50 before "+" or " " " and find their sum, what is the minimum non-negative number of the result? Please list the solution to the equation.

3 A maintenance team set out from place A to overhaul the route on the east-west road, and if it is stipulated that driving to the east is positive and driving to the west is negative, the record of seven trips in one day is as follows. (Unit: km).

The first, the second, the third, the fourth, the fifth, the sixth, the seventh.

1) How far is it from place A to find the end of work?

2) The farthest from place A at the time of the first record.

3) If fuel consumption per kilometer is liters, how many liters of fuel is consumed?

4 If there is a rational number, b satisfies ab 2 +(1 b)2=0, try to find +....value.

Answer: 1 -2 17 33;

3.(1) 1 (2) five (3) 12 3;

14.Shareholder Xiao Yang bought 1,000 shares of a company last Friday, 27 yuan per share, and the following table is the daily rise and fall of the ** in this week (unit: yuan):

Monday, Tuesday, Wednesday, Thursday, Friday.

Change +

1) On Wednesday, how much did it go up or down?

2) How much is the most important per share this week? How much is the minimum price per share?

3) It is known that Xiao Yang paid the handling fee when he bought **, and he also needs to pay the handling fee of the transaction amount and 1 transaction tax when he sells. If Yang sells all of them before Friday, what will be his profit?

1) (+80) = (yuan), that is, ** yuan.

2) 27+ yuan), 27+ yuan).

3) Friday the ** per share.

1000 488 (yuan), that is, a total income of 1488 yuan.

Xiaohong asked her grandfather, who had been a math teacher and was now retired at home, and he said, "If I were as old as you are now, you would not be born in 40 years; If you're my age, I'm 125 years old, I'm an old man, haha! "Q: How old is Grandpa now?

Xiaohong is x years old, and grandpa is y years old.

40+x+x=y

y+40+x=125

The solution is x=15 and y=70

A little, yes, I just read it, a lot of test papers.

The length of an iron wire is 5A+4B, cut a part to enclose a rectangle with a length and a width of B, ask how much is left of this wire?

2a+3b）-2（a+b)

2a+3b-2a-2b=b

2(2a+3b)+2(a+b)-2(a+b)=4a+3b

A worm crawls back and forth in a straight line from point o, and the distance it crawls to the right is recorded as a positive number, and the distance it crawls to the left is negative, and the distance it crawls is (unit: cm): +5, 3, +10, 8, 6, +12, 10

1) Will the worm finally be able to return to the starting point?

2) What is the farthest point of the worm from the starting point o? (Just write the result).

3) In the process of crawling, if two sesame seeds are rewarded for every 1 cm climbed, how many sesame seeds can the worm get?

Solution: (1) (5)+(3)+(10)+(8)+(6)+(12)+(10)=5 3+10 8 6+12 10,5+10+12 3 8 6 10=27 27=0, the worm can finally return to the starting point;

Therefore, the farthest distance of the worm from the starting point o is 12 cm;

3）（|5|+|3|+|10|+|8|+|6|+|12|+|10|）×2=（5+3+10+8+6+12+10）×2=54×2=108，

Since the quantity of the opposite meaning here is a positive number indicating more people than the previous day, then a negative number means less people than the previous day.

From this, it can be seen that on September 30, it was 20,000 people, then, the change in the number of people on October 1 was positive, that is, there were more than the previous day, so the number of people on October 1 was 2+ people, and the change on October 2 was also positive.

The change on October 3 is also positive, so it should be noted that there are more than 10,000 people on October 2, and it is 10,000 people at this time.

The change on October 4 is also negative, so it should be noted that there are fewer than 10,000 people on October 3, and it is 10,000 people at this time.

The change on October 5 is also negative, and it should be noted that there are fewer than 10,000 people on October 4, and it is 10,000 people at this time.

The change on October 6 is also positive, so it should be noted that there are more than 10,000 people on October 5, and it is 10,000 at this time.

The change on October 7 is also negative, so it should be noted that there are fewer than 10,000 people on October 6, and it is 10,000 people at this time.

As can be seen from the above, the total number of tourists in these 7 days should be 10,000.

The average number of people is 10,000.

Solution: If the number of tourists on September 30 is 20,000, the number of tourists on October 1 will be 2+ million, the number of tourists on October 2 will be 10,000, the number of tourists on October 3 will be 10,000, and the number of tourists on October 4 will be 410,000 people, the number of tourists on October 5 is 10,000, the number of tourists on October 6 is 10,000, and the number of tourists on October 7 is 10,000, then the total number of tourists in these seven days is: 10,000.

The average number of people is 10,000 people.

( 2+ 10,000 people is about 10,000 people For the sake of my hard work, give me a little point!! Yes, yes, yes!!

Solution: 2+ (2+ 10,000 people).

Average per day: 10,000 people).

Total number of people in seven days: (2+.)

2*7+ 10,000 people.

Average number of people per day: 28 7 = 40,000.

If |a|=5，|b|=3

1. Find the value of a+b.

2. If|a+b|=a+b, find the value of a-b.

2AR to the power of y+2 cavity dust hole + 5AZ to the power of e+2 power} with the same; Then the brother and grandson asked out.

2ya's y-time wood-kun square + 7e's y-power-4ey}.

You have to give a question! You're not just trying to accomplish it.