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19 tháng 9 2021
\(B1:\)-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
RS
0
hu hu! 2 tick lun!!!!!!!
NI
11 tháng 10 2016
Đặt tích 3 số tự nhiên liên tiếp là A = a.(a+1)(a+2)
Để chứng minh A chia hết cho 2 có 2 trường hợp :
+) Nếu a chia hết cho 2 ( a chẵn ) => A chia hết cho 2
+) Nếu A chia 2 dư 1 ( a lẻ ) => a+1 chia hết cho 2 => A chia hết cho 2
Để chứng minh A chia hết cho 3 có 3 trường hợp :
+) Nếu A chia hết cho 3 => A chia hết cho 3
+) Nếu A chia 3 dư 1 => a+2 chia hết cho 3 => A chia hết cho 3
+) Nếu A chia 3 dư 2 => a+1 chia hết cho 3 => A chia hết cho 3
Mà 2 và 3 là 2 số nguyên tố cùng nhau nên :
A chia hết cho 6 hay 3 số tự nhiên liên tiếp chia hết cho 6
BL
1
3 tháng 5 2019
A = 1 + 3 + 32 + 33 +...+ 32011 + 32012
A = ( 1 + 3 + 32 ) + ( 33 + 34 + 35 ) +...+ ( 32010 + 32011 + 32012 )
A = ( 1 + 3 + 32 ) + 33 . ( 1 + 3 + 32 ) +...+ 32010 . ( 1 + 3 + 32 )
A = 13 + 33 . 13 +...+ 32010 . 13
A = 13 + ( 33 +...+ 32010 ) . 13
Vì 13 \(⋮\)13 nên 13 + ( 33 +...+ 32010 ) . 13 \(⋮\)13
hay A \(⋮\)13
~ Hok tốt ~
B
14 tháng 7 2019
Chia động từ trong ngoặc bằng dạng thích hợp
1. Take this umbrella . It ( rain )____is raining_____
2. Who ( clean )___cleaned_____ the kitchen yesterday afternoon ?
3. I ( not / have ) ____don't have_____ English lesson on Tuesday
4. Next year I ( be ) _____will be_____ a grade 6 pupil
5. Nam ( see) ______saw_____ a ghost in his dream last night
27 tháng 10 2021
1. Lan often ......goes........... (go) to school at 1 p.m.
2. My sister .......is watching............. (watch) TV in the living room at present.
3. Linda and Mi ...........are talking....................... (talk) about Mi‟s friend now.
4. My father ................doesn't work................. (not work) in the evening.
5. Minh and you ........aren't ....... (be not) short.
P
15 tháng 5 2016
1) TV program
I very like watching cartoons. And of all the film I have seen, “Grave of the fireflies” is one in the cartoons which I like most. In Vietnamese it’s called is “Căn hầm đom đóm” or “Mộ đom đóm”. It’s a tragic story about two childents in the war. It’s made from Japan by Ghibli studio, directed and written by Takahata Isao. It is based on a nover of Nosaka Akiyuki. It’s written as a apologize to his sister. With Japanese, this film is understaned as a fable about the respect. Film is been in historical background at the end of the seconds world war from Japan. Film tells a painful story but moving to brothers sentiment of two orphaneds : Seita and Setsuko. They lost mother after a fierce bombing of American air force to Kobe city while their father combat for Japanese navy. So Seita and Setsuko must to struggle to exist between the famine and the resistance to merciless of surrounding people (that have their kinship). They have to live in a shelter-pit and often eat frogs and lizards. At the end, Setsuko have to die for hunger, pictures depict painfulness and the death of little girl can be considered as the most mournful film pictures in the cartoon Japan history. When everybody, who had seen this film are asked, most of them said they cried, and that have me.
2) Future house
My future house will be in the sky. It'll be a large villa surrounded by other clouds and it'll be a hi-tech house. It'll have 20 rooms in the house will have an comdieners, so keep the house cool all the day in Summer. Each room in the house will have a wireless Tv to will help me watch many programmes from space. In my future house will have some robots to will help us do housework , such as: cheaning the floors; cooking meals;...and so on. It also will have a automatic dishwasher, it will dry and wash disher. My future house will have a swimming pool in front of the house and a beautiful garden behind. I will have a super smart phone, it will help me Surf the Internet; send and reiceve e-mails, contact with my friends on other planets. I will live in this house in the future with my family. I really love my future house a lot because I think it's will a modern and comfortable house.
3) Robot
Today, along with the creation of more intelligent robots, how as close to human as possible. Even robots can be built and offers Vietnamese intelligent than humans. Then the situation fantasy about whether Hollywood robots can happen.
Robots and humans
With the momentum of rapid technological rushing, having the researchers fear that robots will one day develop smarter, more formidable man and would have them do day and replaces hegemonic mankind. Is it possible or not this happen?
According to the professor at the University of British leading academic has expressed concern as technology in robotics is growing that robots become an integral part of man. This is not entirely bad. However it can still result in the robot turned to harm humans even though they are programmed into good works. With the current capabilities of the technology, the brains of robots can far exceed people's minds about the intelligence and information processing speed so if given the opportunity we would proceed to dominate the economy, traffic , health ... and eliminate human guide. When the robot is equipped with the technology of artificial intelligence (called the AGI), the robot will not only carry out pre-programmed tasks but also all other things are very complicated. Many researchers are concerned that if the artificial intelligence is fully implemented there will be an end to mankind.
16 tháng 3 2018
1, he must arrive on time
2,what do you do every morning
3,Nam and I are in grade 6
4, Listen! Lan is playing the piano in the music room
CHÚC BẠN HỌC TỐT. NHỚ KB VS MK
16 tháng 3 2018
1. must
2.do you do
3.are
4.is playing
hc tot nha co len ^^
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