Câu 1:D

Câu 2: là x+y và x+1

:)

nhiều thế:))))

C1 B C E 
c2x+Y x+1 3x^3+y  

My school's name is…………... It is not far from our house. I go to my school every day on foot. Our Principal's name is…………... Our class-teacher is……………. There is a small playground in our school-compound. During the tiffin hour, we play there. We play volley-ball and badminton. There are two swings on the side, We swing there merrily. We have a good library on the ground floor of the school-building. Our librarian is…………... She helps us in selecting good books. We take books on loan to read. The students of our school are gentle and disciplined. There is not much noise in our school. Our Principal is very strict. But he is also kind to all. I am happy as a student of my school. I love my school, my classmates, and my teachers. My school is my second home.

I study in Hung Dao School which is one of the best schools of QuanG Ninh. It has a stone building. It has all facilities a good school should have-well furnished classrooms, laboratories, library and playground.

As we enter the school, there is a playground to our left and a small garden to our right. When we enter the building, the Principal’s room and the office room are to the left and the staff room to the right side. These are well furnished. There are thirty four classrooms. Our labs are well equipped. Our library has books almost on all subjects. Our Librarian is also very helpful.

Our school, all schools, has a prescribed uniform. We have to wear white or cream cotton shirts, light-blue trousers, black shoes and white socks. Girls have to wear white blouses and light-blue skirts in primary and middle classes and white shirts and light-grey skirts in higher classes. They have to tie white ribbon also.

In our school special attention is paid to behavior, cleanliness and punctuality. The most well behaved, neat and punctual student is awarded a prize at the Annual Day function.

Our Principle is a strict disciplinarian. He takes the help of P. T. Teachers too. If any one violates the rules, and is not in uniform, or makes mischief, he gets punished. But he is fair and loving. He tries to find out the reason and guides us.

Our teachers are also quite strict. They teach us with great care, check our note-books, help us when we need but if we are inattentive and don’t work properly, then we are punished.

I my school very much and I am proud that I belong to it. I shall never forget it.

Hi everyone.My name is Ha.Iam ten years old. Iam a student.I am class in 4b. This is my school. my name is Kim Son primary school.There are twenty classroom in my school.It is has fifty five teacher and six hundred and fifty student.Our teacher teach are very well.Student in my school are very friendly.Iam love my school.

Câu 20: C

Câu 21: B

Ủa r siêng năng may vượt mức chi r để hs phải đi tính zị trời😤

mn giúp e với ạ

a: 2+5/6=12/6+5/6=17/6

b: 5/12+3/4+1/3=5/12+9/12+4/12=18/12=3/2

c: 2/3+3/4=8/12+9/12=17/12

const fi='kt.txt'

fo='kq.out'

var f1,f2:text;

s:string;

i,dem,d:integer;

begin

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

readln(f1,s);

d:=length(s);

dem:=0;

for i:=1 to d do 

 if s[i]='e' then inc(dem);

writeln(f2,dem);

close(f1);

close(f2);

end.