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\(B1:\)-Ta xát tổng của M
48 chia hết cho 4
20 chia hết cho 4
Ta áp dụng công thức a chia hết cho d;b chia hết cho d;c chia hết cho d
=>a+b+c chia hết cho d
=>Để m chia hết cho 4 thì a cũng phải chia hết cho 4
Để M không chia hết cho 4 thì a phải không chia hết cho 4
\(B2:\)1x2x3x4x5x...x20
=(5x20x4)x1x2x3x...
=400x1x2x3x...
Ta có 400 chia hết cho 400
Ta áp dụng công thức
a chia hết cho b thì a nhân với bất kì số nào cũng chia hết cho b
=>A chia hết cho 400
\(B3:\)Ta có n+10 chia hết cho n+1;n+1 chia hết cho n+1
=>(n+10)-(n+1) chia hết cho n+1
a,(n+10)-(n+1)=9
=>9 là bội của n+1
Ư(9)=(1;-1;3;-3;9;-9)
| n+1 | 1 | -1 | -3 | 3 | 9 | -9 | |
| n | 0 | -2 | -4 | 2 | 8 | -10 |
=.n=(0;-2;-4;2;8;-10
nowadays english is one of the most mean to speak with anyone over the wold so it is spoken by person in any nation most of secondary school , english is a compulsory subject so student must learn it. I like E so I always want to improve it. I learn it everywhere : at school,at home,........I am bad listening and writing so I usually listen to radio , do exercises,write letter for my friend in E and practive with my friend . In the future, I will use my E for E my work.
If you ask me Do you like English, I will answer that I very like English. I learn English 4 years ago. When I started learn English, I felt very bored and difficult. Until now, I feel learn English is so interesting. I can talk with many foreigners. It makes me more confident than before. In many lessons about English, I feel very excited. Now, I'll learn English better to implement my dream. That's all.
Tet (Lunar New Year is also called the Great, I Tet, the Lunar New Year, or Tet is simply called Tet) is the most important holiday in Vietnam, the same culture as the Lunar New Year of the East Asian countries. Before Tet, often with another day to edit compose những like "Kitchen God Festival" (Chap 23 lunar months) and "All Year" (Chapter 29 or 30 months of the lunar calendar)
Since the New Year is calculated according to the lunar calendar cycle operation of the Moon's beige Vietnam Tet New Year Late coal (also called Nom na is New Year). 3 due to the leap year rule one month of the lunar New Year's Day beige of the Lunar New Year never before January 21 following the calendar and the solar calendar February 19 falls on blank Thường mà Last January to February centered calendar Street. The entire annual Lunar New Year lasts for about 7 to 8 days old and 7 year-end New Year's Day (23 December to end on 7 January).
Annually, the Festival held on the first day được January 1 in the country according to the lunar calendar Vietnam and other countries out of some Vietnamese communities have lived. In the New Year, the family of total meeting together, as a family visit, lucky and ancestor worship ... As customary, usually with những Festival taboos.
Persons Vietnam Tet, the notion that everything's all right very soon and the new. Therefore before the New Year more than 2 weeks, the family has prepared for the New Year. They often sweeping, home decoration, flower shop, shopping ... so thoughtful food for the New Year. In addition, all non-essential items or alleged to also bring ominous discarded.
The work to prepare for the day of the Vietnamese New Year usually starts from December 23, the day that Vietnamese people worship him Tao (Kitchen God). In view of the Vietnamese people, he is both a mental Apples indoor kitchen is both scribe all good and bad deeds that people did in the old year and to report to the Jade Emperor's good and bad issues homeowners. Ong Tao is offered at noon or afternoon of 23 lunar month every year. Rituals include incense (incense sticks), candles, fruits, gold stocks and two hat man, a woman with three caps carp (carp carp real or made of paper enclosed deck caps). According to the legend he Apples, Apples carp takes his pass to Heaven Vu Mon to meet the Jade Emperor. Some rural families still preserve tradition tree up above, while in the city, this custom has been forgotten. According to custom, raised trees are erected against evil and foreboding. Commonly referred hanging tree ornament or more things are considered to scare the devil, such as garlic, cactus, effigies and Pandan. Before Tet, the Vietnamese also prepared cake shoes while in the south it's popular cakes banh tet and hearty dishes to offer to ancestors
:) Mình cũng gặp phải cái này mà chưa biết làm :( Thầy chỉ gợi ý thôi :
Hello, My name is .... I'm .... years old. .....
8 = 2.2.2 = 23
16 = 2.2.2.2 = 24 = 4.4 = 42
27 = 3.3.3 = 33
Tương tự : 64 = 26 = 43 = 82
81 = 34 = 92
100 = 102
Chúc bn hc tốt <3
THAM KHẢO
1. Write an e-mail to a friends to tell her/him about your house
2. Write a paragraph about your school.
The name of my school is Rasulpur govt high school. It is in Gafargaon Thana under Mymensing district. There are five hundred students and eighteen teachers. There are 15 rooms in the school. Thirteen rooms are for classes, one room is for the teachers and the other is for the Head Teacher. The results of the school is good. All the teachers of our school are very friendly and helpful. They are high qualified teacher. They teach us with pleasure. They loves us like their own children. There is a big play ground in front of the school. I love my school very much.
3. Write a paragraph about your best friend.
Everyone has their closed friends to share happiness and sadness.So am i.My closest friend is Dung.He is quite a intelligence boy,ease-going,and especially homourous.Thanks to his nice appearance,he has bring a lot of fun to everyone around him not except me.Besides,Dung is also a optimistic boy,he always smile on his face even in most difficult situations.Morever,he learns very well,he is usually on the top of my school,he has now helped many weak friends to be better in their learning.Not only does Dung a excellent student,but he also is a good son in the family.Dung often help his family with housechores and even earn more money by doing half time of jobs.Although he is busy all time,he try to spend as much time as possible sharing happy or sad things with me.As for me,i really happy to be friend with such a wonderful person like Dung.I hope our friendship will be forever.
4. Write a paragraph about your neighbourhood, saying what you like or dislike about living there.
I'd like to tell you some good things and some bad things about living in my neighbourhood. Our door activities here is great because it's has sandy beaches, peaceful street and sunny weather. It's has everything i need: shops, market, good restaurant and café. And it's has many modern buildings and offices. It's also has somethings i dislike. The street has heavy traffic and it's very busy and crowded. Who can write about what you like and don't like about your neighbourhood?
5. Write a paragraph about a wonder you know.
There are several heritage and splendid sights in Vietnam. Especially, Da Nang is one of the most popular place for both Vietnamese and foreign tourist. Da Nang includes sea, Son Tra island, mountain and beautiful landscape. There are a lot of interesting places such as: Asia entertainment park, Ba Na hill, Hoi An ancient town, My Khe beach, museum of art as well as famous bridges. The city is well known for its fresh atmosphere, friendly people and security. The weather is glorious all the year and it brings this city many delicacies from sea and perfect living condition for people, specifically the elder. Visiting Da Nang, I am really impressed by Ba Na hill containing longest cable car from land to the top of the mountain. It is an unforgettable experience for visitors to observe breathtaking sight and picturesque scene. Beside, the beaches have long golden sand, deep blue sea in addition huge bunches of fresh coconut. Tourist has a chance to relax, enjoy the peace and nature, play aquatic sport. Moreover, the city has many big bridges like: Dragon bridge, Quay bridge and a large outdoor entertainment named Asia park. Additionally, there are a lot of delicious typical dishes such as: Quang noodle, xeo cake, pork pan-cake and others. Da Nang is preserved for its natural beauty; therefore, there is an increasing number of tourists come here. Consequently, it leads to polluted environment, natural damage and other social problem. However, the security of the city is good that there is no street robbery. Hence, Da Nang is voted to be one of the most worth-living cities in Vietnam. In the future, I hope Da Nang will develop and become more popular over the world.
6. Write an e-mail to a friend about your Tet holiday.
a,stool --< stools
b,clock --> clocks
c,student --> students
d,teacher --> teachers
e,stereo --> stereos
g,door --> doors
h,eraser --> erasers
i,couch --> couches
k,lamp --> lamps
l,table --> tables
m,chair --> chairs
n,bag --> bags
o,nurse --> nurses
p,board --> boards
s,case --> cases
Viết số nhiều của các từ sau:
a. stool=> stools
b. clock=> clocks
c. student=> students
d. teacher=> teachers
e. stereo=> stereos
f. door=> doors
g.eraser=> erasers
h. cough=> coughes
i. lamp=> lamps
k. table=>tables
l.chair=>chairs
m.bag=>bags
n.nurse=>nurses
o. board=> boards
p. case=>cases
.Tìm giá trị của n để:
đạt giá trị lớn nhất. Tìm giá trị lớn nhất đó.
x/9 - 3/y = 1/18
\(A=\frac{n-2}{n+3}\)
a) Để A là phân số khi n+3 khác 0 ( n thuộc Z)
vậy n khác -3 ( n thuộc Z ) thì A là phân số
b) Để A nguyên khi n-2 chia hết cho n+3
mà n+3 chia hết cho n+3
suy ra n+3-(n-2) chia hết cho n+3
suy ra 5 chia hết cho n+3
n +3 \(\in\left\{1;-1;5;-5\right\}\)
n \(\in\left\{-2;-4;2;-8\right\}\)
Thử lại
| n | -2 | -4 | 2 | -8 |
| A=\(\frac{n-2}{n+3}\) | -4 | -6 | 0 | 2 |
| TM | TM | TM | TM |
\(B=\frac{10n-3}{4n-10}=\frac{\left(4n-10\right).\frac{5}{2}+22}{4n-10}\)
\(B=\frac{5}{2}+\frac{22}{4n-10}\Rightarrow B=\frac{5}{2}+\frac{11}{2n-5}\)
ĐỂ B đạt GTLN khi \(\frac{11}{2n-5}\)đạt GTLN, điều này xảy ra khi 2n - 5 là số nguyên dương nhỏ nhất,
tức là 2n-5=1 suy ra 2n=6 suy ra n=3
Khi đó \(B=\frac{10.3-3}{4.3-10}=\frac{27}{2}\)
Vậy B có GTLN là 27/2 khi n
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