hello, my name is .(tên bạn).. Today, i'll tell you about my class recess. The recess lasts for 15 minutes. At recess, my class has a lot of activities. For example, some boys play soccer, play marbles and play tag while girls skip rope. For me, I usually study under the tree. At recess, I like sitting around and reading books reading stories helps I feel more relaxed. The recess of my class is fun and exciting. I love the recess very much because it helps me relax after stressful hours.

Of course, recess time is the most enjoyable time in school after learning hard from the first period. There are two recess time in my school. These two recess time are essential for us to unwind and to fill up growling stomach.As soon as the school bell rings for recess, all students perk up. School work burden is forgotten, at least for a while. All the sorrows of being scolded and getting bad marks areforgotten. There will be a stampede towards the canteen. The junior students particularly are chattering in a jovial mood. However, there will be some students going for meetings, going to the library and the washrooms to refresh themselves. Only a minority stays in class.

The benches in the canteen at recess time are never unoccupied. Some of them even have to put their things on the tables in the canteen to ensure a seat. An advantage in size could certainly be a great help here. Every stall is always crowded with students. Some of the hawkers are not able to serve thecustomers at once. It is also hard to walk through the rowdy crowd in the canteen. Believe me, you will experience beingpushed from one side to another.

Some hearty laugh and chat are always heard. Though recess time may seem short, it is the time for students to share endless gossip with their peers. Very often you will hear the hawkers' screaming at the top of their voices to control the students from pushing and shoving. Some prefects are on duty to control these "uncivilised people". Unfortunately, it makes not much difference. And of course, some impatient students willscream out: "Quick, Auntie, quick, the bell for going back to class will ring soon."

Meantime in the library, several students are busy searching and skimming the books for extra reading and setting information for their assignments. Several students can be seen engrossed in the daily news with their best friends. The scene in the library during recess time is quiet and full of disciplinealthough some quiet chat can be heard.

Some hard-working student or I should say bookworm will stay in their own class to finish their homework or revise. While some students are seen carrying out their cleanliness duty. You may see of a couple of girls diligently mopping the windows, sweeping the floor and cleaning the blackboard. It is certainlypleasant to study in a spick and span class room.

Some of the students will also enjoy walking around the passageways in front of the classrooms or in the park chatting with their peers. Some younger students who have not 'tasted' school work pressure play hide and seek with their friends. While the older ones are deep in thought in some corners. A few are seen trying to solve additional Maths or Physics problems. Certainly, one will also see some pupils running here and therealong the passageway while the others just loiter around.

In the wash rooms, you may find some students washing their faces to refresh themselves after studying hard since morning. Some even have to stand in a queue for a while to use the toilets. The toilets are never unoccupied. Each class has is specified for its own toilet.

All in all, I can say that the scene in my school during recess time is one of noise and many students. Students enjoy their own activities during this time. I, myself, enjoy every moment of recess time very much.

In the school yard children, every 2 each session details are to recess. A drum up, but as fun loudly urging us quickly run out .... romp.
Wide school yard a few minutes ago that, deserted and quiet suddenly as narrow, not even enough room for noise and hundreds of large and small pupils, from Grades flush profusely as massive streams, multi-colored sharp. Shuttlecock few top men quickly occupied, arrayed, foot stone Thoan, mouth à á call each other, red and blue orbs flying over, fly back, flew up, fly down. Many girls playing jump rope rhythmically and healthy, spinning wire spiraling, undulating dancer with a smile, hair flying in the wind. Original few eagles around women with women, men with men, many of you are playing tag, chasing people who flee flashed bucket to run, the purple ears. Some you like jokes huddled storytelling fun, laughing, with him jumping happily cheered! Many couples holding hands, walking around, talking to small giggle. Some make you curious to look at the fence looking around she sold plots vicious looking sour apricot, deep sweetness. Teacher observations, standing afar off, would also spread the fun out of our joy.
Recess filled with laughter and voices wa also go very fast. A solemn drumbeat sounded. Drumming like a miracle that we had like a hundred silent gradually, rushed into the classroom, the school returned to the air, quiet terrace, its tranquility..

a. hàng phần nghìn 

b. hàng đơn vị  

Cảm ơn Nguyễn Hương Linh nha!

bài 32 đề kiểu j z bạn, bài 29 mình đang nghiên cứu, hóc búa phết dấy :V

thế này nhé, hơi dài với khó hiểu

lấy n là trung điểm bh

cậu tự cm mn là đường tb tam giác ahb

=> mn// và = 1/2 ab

mà abcd là hình chữ nhật => ab// và = cd

từ 2 điều đó => mn // và = ck

=> mnck là hình bình hành

=> cn // mk (1)

vì mn // ab mà ab vuông góc bc

=> mn vuông góc bc

tam giác bmc có mn vuông góc bc và bh vuông góc mc, 2 đường này giao tại n

=> n là trực tâm (2)

từ (1) và (2) =? mk vuông góc với bk

=> tam giác bkm vuông tại m

=> bm^2 + mk^2 = bk^2 (3)

abcd là hcn => góc c = 90 độ

=> tam giác bkc vuông c

=> bc^2 + ck^2 = bk ^2 (4)

từ (3) và (4)

=> bm^2 + mk^2 = bc^2 + ck^2 (= bk^2) (5)

=> mà ck = cd/2 (6)

từ (5) và (6) => ĐPCM

cái => ĐPCM ấy nhiều trường không cho nên cũng có thể thay = cái yêu cầu của đề bài nhá, bạn còn bài nào khó như z không, cho mình xin :)

a: Xét ΔABM và ΔACM có

AB=AC

BM=Cm

AM chung

=>ΔABM=ΔACM

b; Xét ΔAHM vuông tại H và ΔAKM vuông tại K có

AM chung

góc HAM=góc KAM

=>ΔAHM=ΔAKM

=>AH=AK

c: Xét ΔABC có AH/AB=AK/AC

nên HK//BC

Cách đánh độc đáo, dựa trên 3 yếu tố chính :

– Bất ngờ:

+ Bí mật vượt sông Gián Thủy

+ Sau đó tập kích bất ngờ tại đồn Gián Khẩu

+ Một số đồn tiền tiêu của giặc được quân của Lê Chiêu Thống trấn giữ, tướng nhà Lê là Hoàng Phùng Tứ bỏ chạy

+ Nguyễn Huệ cho quân theo hướng sông Thanh Quyết đẩy nhanh tốc độ quân cơ động tiến công

– Thần tốc: tổ chức hành quân chỉ trong 04 ngày (từ ngày 22 đén 26/12/1788), Nguyễn Huệ xuất quân cơ động từ Huế tiến đến Nghệ An

– Đồng loạt: 

+ Quân tây Sơn nhanh chóng đánh chiếm các đồn Yên Quyết, Nam Đồng

+ Đồng thời, đánh thẳng vào trung tâm đầu não của địc

+ Trước sự ngỡ ngàng, hốt hoảng của chủ tướng giặc, Tôn Sĩ Nghị “ngựa không kịp đóng yên, người không kịp mặc áo giáp (Trích Hoàng Lê nhất thông chí Hồi thứ 14) ” cùng một toán kỵ binh vượt cầu phao sông Nhị Hà nhằm hướng Bắc tháo chạy

Đồng bằng ven biển Bắc Phi 

Ta có : \(\left(a-2\right).\sqrt{2}=b+1\)

Từ giả thiết a,b là các số hữu tỉ nên ta có VT là một số vô tỉ, vế phải là một số hữu tỉ. Do đó ta cần tìm a để VT là một số hữu tỉ. Nhận thấy chỉ có a = 2 thỏa mãn . Suy ra b = -1

Vậy (a;b) = (2;-1)

dấu căn j mà ngộ thế kia be cả dấu = 

mk đánh nhầm, đề là \(\left(a-2\right).\sqrt{2}=b+1\)

28% = 0,28

33388% = 33,388

28% = 0,28

33.388% = 333,88

Chúc bạn học tốt.

😁😁😁