If (a-2b) x ^ 2Y ^ A-1 is a quintic monomial about x.y, what is the condition that A.B satisfies

If (a-2b) x ^ 2Y ^ A-1 is a quintic monomial about x.y, what is the condition that A.B satisfies

(a-2b) x ^ 2Y ^ (A-1) is a quintic monomial of x.y
2+(a-1)=5
a-2b≠0
a=4
b≠2

Given that (A-2) x ^ 2Y, | a | + 1 is the quintic monomial of X, y, try to find the value of A
Seek the process!

The frequency of (A-2) x ^ 2Y | a | + 1 is 2 + | a | + 1 = 5, a = ± 2
If the coefficient A-2 ≠ 0, then a = - 2

What is the perimeter of 300 mu

Not necessarily, different combination of length and width, different perimeter

. column 1 column 2 column 3 column 4
First line 1 4 5 10
The second line 4 8 10 12
The third line 9 12 15 14
.....
Try to explore: 1. What is the number of the second column of the tenth row? 2. What are the rows and columns of 81? 3. What are the rows and columns of 100?

Sister Hao Yi
The number in the second column of the tenth row is 40
2.. 81 is in the first column of the ninth column
The row and column of 3.. 100 are the tenth and the first column respectively

Similar to the formula of 56 out of 57 times 37, how to calculate? Do you want the denominator to be directly multiplied by the numerator? Is there any secret?

56/57×37
=（1-1/57）×37
=1×37-1/57×37
=37-37/57
=36 and 20 / 57

What's the area of the door

Length times width, the same algorithm

Proof: the sum of the distances from any point in an equilateral triangle to three sides of the triangle is equal to the height on one side

As shown in the figure, let the side length of an equilateral triangle be a, ｜ s △ ABC = 12bc · ah = 12a · ah ∵ s △ ABC = 12ab · PD + 12bc · PE + 12ac · pf = 12 × a · ah = 12 × a · PD + 12 × a · PE + 12 × a · pf = 12a (PD + PE + PF) ｜ PD + PE + pf = ah, that is, the sum of the distances from point P to the three sides of the triangle is equal to the height on one side

What is 26 × (5 / 13-2 / 15) × 1 / 30

26 × (5 / 13-2 / 15) × 1 / 30
=26 × (5 / 13-2 / 15) * 30
=30 * (5 / 26 × 13) - 2 / 26 * 15 * 30
=30*10-26*4=196 ...

Landscape composition in my eyes
No less than 600 words

Here you will be reluctant to leave, maybe you think I am bragging. But you will not think so after reading my following article
As soon as we enter our school, there is a wide playground. On the playground, the sun shines on the earth and warms the trees and plants that have just turned green. What emerges in front of me is the steaming court with players running on the basketball court. It is a neat radio exercise team with students doing neat and uniform actions. It is a one-way column on the runway, Every time after class, the students rush to the playground like birds, and the lower grade students jump on the playground www.fwdqw.com Senior students are playing basketball and kicking keys on the playground. It's so fun It's like a picture of vitality. There is a solemn and bright red flag on the rostrum. Every Monday morning, with the march of the volunteers, the five-star red flag rises slowly, and the students sing the national anthem, which gives birth to a kind of love for the motherland from their hearts
Around the playground are rows of trees, maple, cypress Every autumn, the maple takes off its green coat and puts on its red cotton padded jacket. The autumn wind falls in clusters, and the students come to the playground to pick up maple leaves for specimens
In the west of the playground is a big flowerbed, in which there are more than two inches of grass. From a distance, it looks like a layer of green carpet. The grass is covered with white peony, Purple Lilac, pink rose, fragrant osmanthus Every summer, the blooming flowers are just like a bunch of burning flames
The north side of the playground is the teaching building. Standing on the side of the playground, you can hear the sound of reading. The students study in the spacious and bright classroom. They have a good learning environment, and they are more motivated to learn
Ah! Our school is so beautiful. I believe I'm not bragging. The campus makes me proud. I want to make it more beautiful with my own hands
Responder: good friends are particular - probation level 1 12-2 18:46
Campus is the place where we live and study every day. About two-thirds of the time we spend in school every day, so the hidden danger of campus safety is directly related to our life safety
There are also some unsafe factors in our school. For example, because our campus is very small, only two basketball courts are so big, we can't let more than 20 classes do it at the same time, so we divided them into several groups. They all stood well and led the team down during the big break. Because some classes that didn't do exercises had already finished their classes in the corridor, the corridor which was not spacious became more crowded, If there are some students above, they will suffer. Do exercises or lead the team in an orderly way. But when it's noon, the students rush down. Isn't it more dangerous? Besides, during PE class and recess, the students like to play basketball and sweat all over the playground, which will affect the quality of next class, Bumps often happen
At noon, some students who don't go home buy some food at the school gate to make do with it. There are many restaurants near the school, which are usually very cheap. I know from the newspaper that the food hygiene and safety in these places are difficult to guarantee. These stores are basically one room, with small operation area. There are too many school side stores with no food and expired food, and the phenomenon of operating without a license is common, Employees did not carry out health examination and training, food safety hazards, and no tableware disinfection, cleaning facilities, no three prevention facilities, hand washing, dish washing and disinfection share a pool or bucket, some even do not even have a refrigerator. Such an environment is really worrying, we think we are afraid
The China Youth Research Center conducted a survey, The results show that safety accidents have become the first cause of death for children under 14 years old. Campus safety involves more than 20 kinds of hidden dangers in teenagers' life and learning, including food poisoning, sports injury, online dating safety, traffic accidents, fire risk, drowning, drug hazards, sexual assault, AIDS and so on. Therefore, it is imperative to create a healthy and civilized campus environment Slowly, in fact, some potential safety hazards are caused by ourselves, so we have to solve them ourselves. For example, when we finish school, we can consciously go to the right side, and the school can draw a sign line in the middle of the stairs to remind us all the time to reduce unnecessary accidents. Because eating out is not clean, I hope the school can set up a canteen, In fact, security risks are everywhere. We should be good at finding and solving them
In my mind, Ping'an campus is a very safe and environmentally friendly beautiful campus. As soon as I enter the school gate, every student has to be checked by a robot to see if the students have any dangerous goods. Then I walk forward to see a playground. There is a robot on the playground, who is responsible for cleaning the playground. If there are students who litter, he will stop them in time, It also has an important task to protect the safety of students. If a student wants to fall, it will help the students up before they fall. There is a big flower bed beside the playground, in which the flowers and trees will never wither. In the center is a pine tree. It is surrounded by all kinds of flowers and plants, colorful and beautiful. There are many thorns around the painting bed, If any naughty child wants to touch it, the "safe guard robot" in the garden will stop you. If you don't listen, it will tell good jokes. After you are happy, you won't be so naughty
Behind the grassland is the neatly placed desks in the teaching building. There is also a robot in each classroom, which will remind students to pay attention to safety at any time. For example, in the manual class, when students cut paper, the robot will automatically remind them to "pay attention to safety"
Physical education is not the same as before on the playground, all moved to the roof, the roof is like a gymnasium, surrounded by spectators, the middle is our activity site, physical education when there is a teaching assistant, it will always look at the students, in case of accidents, Need to according to your grades, different Internet access mode, I believe students who want to play will make efforts, positive, it makes students healthy Internet. Not addicted to the Internet bar
I believe that the safe campus in my heart is not far away
Answer: Tennis 616 - doorman II 12-2 18:51
Our school, hope primary school, is located in Guang'an, grandfather Deng Xiaoping's hometown. It's a park full of birds and flowers. You will be reluctant to leave here. Maybe you think I'm bragging. But you won't think so after reading my article below
As soon as we enter our school, there is a wide playground. On the playground, the sun shines on the earth and warms the trees and plants that have just turned green. What emerges in front of me is the steaming court with players running on the basketball court. It is a neat radio exercise team with students doing neat and uniform actions. It is a one-way column on the runway, Every time after class, the students rush to the playground like birds, and the lower grade students jump on the playground www.fwdqw.com Senior students are playing basketball and kicking keys on the playground. It's so fun It's like a picture of vitality. There is a solemn and bright red flag on the rostrum. Every Monday morning, with the march of the volunteers, the five-star red flag rises slowly, and the students sing the national anthem, which gives birth to a kind of love for the motherland from their hearts
Answer: Yue xiaoyueyue - Magic apprentice level 1 12-2 19:08
My school is a typical garden school. It's beautiful. Let me introduce it!
Walking into the school gate, you can see a sculpture with a moon and a star, and a young pioneer standing on the moon. On the marble under the sculpture, the word "take-off" is written. Young Pioneers step on the sails of their dreams and hold their dreams in their hands, which symbolizes that we are about to let our dreams fly. Many red flowers are planted in the flowerpot beside the marble. From a distance, it looks like a red flame, It's the embodiment of our passion for learning. Around the slope, we come to the particularly popular window. There are some beautiful paintings and calligraphy pasted in the window, all of which are the works of our classmates. Then we turn around to the school gymnasium, also known as the stormy playground. In summer and winter, students have PE lessons in the stormy playground, avoiding the heat and cold, and combining sports with comfort, In the morning, the red flag rises from here. In the evening, the red flag falls with the beautiful sunset. The lower corner of the rostrum is the inclined flower bed, which looks like a huge green blanket. When you look closer, you will know it is the flower bed. Go down the stairs beside the flower bed, It's the big playground. In spring, the grass sprouts. The green grass is lovely, swaying in the spring breeze and dancing its tiny body. In summer, the grass grows more vigorous and green, as if wearing a green Cape to the playground. Now the playground is replaced by a plastic playground, which is composed of red and green. Red represents passion, green represents hope, We hope to sing the most beautiful future with passion. The plastic playground brings convenience to the activities of the students. Then from the stairs, there is the classroom. In the morning, there are loud reading sounds, music lessons, and beautiful songs in the classroom. These sounds represent the students' desire for knowledge, and represent their ancestors