Put 9 numbers in 1.2.3.4.5.6.7.8.9 into 3 formulas, but each number can only be used once

Put 9 numbers in 1.2.3.4.5.6.7.8.9 into 3 formulas, but each number can only be used once

Condition: these three expressions can only be added
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45, an odd number!
And three equations are formed, and the two sides of the equation are equal,
Add the two sides of the equation, it should be even! Produce contradiction! This problem has no solution! To a good mathematical problem, it is not easy!

Calculate 34 with + - *_ 5_ 6_ 8_ 9_ 1_ 2=2008

(34*5*6-8-9+1)*2=2008

Mathematics Grade 8 Volume 1 one time function application question
1. The school is going to take a spring outing in Baiyun Mountain. The original price of travel agency a and B is 60 yuan per person, and both of them show preferential treatment for students. Travel agency a says: 20% off for all; travel agency B says: 10% off for no more than 30 people, and 70% off for more than 30 people
(1) If the number of students is x, the total fees actually charged by travel agencies a and B are Y1 and Y2 (yuan), try to list the functional relations between Y1, Y2 and X respectively
(2) Which travel agency should I choose?

(1) If the number of students is x, the total fees actually charged by travel agencies a and B are Y1 and Y2 (yuan), try to list the functional relations between Y1, Y2 and X respectively
y1=48X
When x is less than or equal to 30, y2 = 54x
When x is greater than 30, y2 = 42x
2) Which travel agency should I choose?
The discussion is divided into situations
When x is less than 30, select a
When x is greater than 30, select B

The weight (kg) of 10 sheep were 47.51.52.53.54.55.57.58.59. The median, mode and average were calculated
Mathematics in grade five of primary school

The median, the number in the middle, is 54
All of them
Divide the average by nine to get 54

After reading this essay, my feeling is:
Susan is a lovely little girl. When she was in the first grade, she had a tumor in her little body and was hospitalized for three months of chemotherapy. After she was discharged from the hospital, she looked thinner and her face was not as lively as usual. What's more terrible is that her beautiful golden hair was almost gone now. Although her vigorous vitality and longing for life were enough to compete with death, She is smart and studious enough to make up for the lessons left behind. However, it is very cruel for a six-year-old girl like her to go to school with a bald head every day
When Susan got the news that she was going back to school, Helen, the teacher in her class, asked some of her classmates to discuss quietly······
Before Susan returned to school, Helen, the teacher of the class, announced enthusiastically and solemnly: "from next Monday, we will learn to know all kinds of hats. All students should wear hats to school. The more novel the better!"
When Monday arrived, Susan, who had been away from school for three months, returned to her familiar classroom for the first time. However, standing at the door of the classroom, she hesitated······
However, when Susan looked into the classroom, every one of her classmates was wearing a hat. Compared with their various hats, her hat was plain and hardly attracted anyone's attention. She felt that she was no different from others. Nothing could prevent her from meeting her friends freely. She laughed easily, so sweet and so beautiful
The days went by like this. Now, Susan often forgot that she was wearing a hat, and her classmates seemed to forget too

After reading this essay, I deeply realized a teacher's love for students
The teacher is the engineer of the human soul, which only shows the teacher's efforts in learning the students. However, this article takes a student's illness as a clue to make a deep description, It also shows the teacher's meticulous love for the students. At the same time, it also shows the concern and love between the students

Chinese synchronous exercise lesson 7 (human teacher) answers

Spiders and scientists in the morning, you see a spider web hanging on the eaves, which may not attract much interest. But do you know that this kind of insect is not attractive, but it has attracted the attention of many scientists. The spider has no muscle in its legs, but it is very flexible. It turns out that its legs are full of a kind of liquid, and the spider can adjust at any time

2x-18 = 4x to solve the equation
Please write out the equation process

2x-18=4x
4x-2x=-18
2x=-18
x=-9
Do not know, welcome to ask

The simple calculation of 3.75 * 99 * 2 + 7.5 is

3.75×99×2+7.5
=3.75×2×99+7.5
=7.5×99+7.5
=7.5×(99+1)
=7.5×100
=7500

How to do the third question on page 86 of the fifth grade volume I

6.5+5=11.5
241.5 / 11.5 = 21 yuan badminton
21 times 6.5 = 136.5 (yuan) badminton racket

How much is the current price of an article after the original price of 1OO yuan and two consecutive price cuts of one tenth?

100 yuan * (1-10%) * (1-10%) = 81 yuan