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15 tháng 10 2018

a, a=9;b=4

b, a=3;b=9

15 tháng 10 2018

Gọi A là số chính phương A = n2 (n ∈ N)

a)Xét các trường hợp:

n= 3k (k ∈ N) ⇒ A = 9k2 chia hết cho 3

n= 3k 1  (k ∈ N) A = 9k2  6k +1 chia cho 3 dư 1

Vậy số chính phương chia cho 3 chỉ có thể có số dư bằng 0 hoặc 1.

+Ta đã sử tính chia hết cho 3 và số dư trong phép chia cho 3 .

b)Xét các trường hợp

n =2k (k ∈ N) ⇒ A= 4k2, chia hết cho 4.

n= 2k+1(k ∈ N) ⇒ A = 4k2 +4k +1

= 4k(k+1)+1,

chia cho 4 dư 1(chia cho 8 cũng dư 1)

vậy số chính phương chia cho 4 chỉ có thể có số dư bằng 0 hoặc 1.

+Ta đã sử tính chia hết cho 4 và số dư trong phép chia cho 4 .

     Chú ý: Từ bài toán trên ta thấy:

-Số chính phương chẵn chia hết cho 4

-Số chính phương lẻ chia cho 4 dư 1( chia cho 8 cũng dư 1).

bạn à câu C hình như bạn viết thiếu đề

15 tháng 10 2018

bạn học lớp 6 mk cũng vậy những câu  này bạn phải lên trường khác chứ

Hình tượng bay bổng diệu kì nhằm kì vĩ hóa, tô đậm chất lãng mạn để bất tử hóa về vẻ đẹp của người anh hùng sinh ra phi thường, ra đi đánh giặc phi thường, bay về trời hóa thành bất tử, sống mãi trong lòng mọi người. Con người vĩ đại không nhận công danh, ơn vua lộc nước, không màng danh lợi, tất cả để lại cho đất nước, cho nhân dân.

OK XONG RÙI!!!!!!!!!!!

HÃY giúp VỊT BẦU LÀM BÀI NÀY!1. What does Mrs. Smith do? - She’ a……A. farm              B. policeman              C. doctor             D. businessman2. What …… do you like?- I like warm weather.A. season          B. activity                 C. weather             D. sport3. It usually ……in March.A. torains             B. rain                 C. raining                D. rains4. …… weather is often cool...
Đọc tiếp

HÃY giúp VỊT BẦU LÀM BÀI NÀY!

1. What does Mrs. Smith do? - She’ a……

A. farm              B. policeman              C. doctor             D. businessman

2. What …… do you like?- I like warm weather.

A. season          B. activity                 C. weather             D. sport

3. It usually ……in March.

A. torains             B. rain                 C. raining                D. rains

4. …… weather is often cool in Sapa.

A. The             B. No             C. A                   D. Some

5. What’s ……lunch, Ben? - There some rice and some fish.

A. at                 B. in               C. of                D. for

6. How does your father often treval to Ninh Binh City? - ……train.

A. On              B. At              C. By               D. In

7. What …… are her eye? - Black.

A. time              B. class            C. colour       D. subject

8. …… a letter here ……you.

A. It’s/ on               B. It’s/ for                C. There’s/ for             D. It has/ on

9. She is working in the garden. She look ......

A. hungry                B. tired                   C.interesting                   D. thirsty

10. Odd one out

A. dog                    B. cow                   C. pig              D. string

11. We shouldn’t ....a lot of in the evening.

A. eat                     B. to eat                  C. eats                  D. eating

12. What’s the matter Danny? - I’m.....

A. nice                   B. cold                   C. big                   D. tall

13. The boy ...... his teacher some beautiful flower.

A. like to give                  B. like giving           C. like gives              D. would like to give

14........ about going to NhaTrang?

A. Why                B. What                 C. Where                 D. When

15. We have a lots of ....... in the summer.

A. rain              B. raining                 C. rains                    D. rainy

16. There are twelve months in the a........

A. week                B. year                C. weekend                D. daily

17. They buy some fruit but ..........vegetables.

A. some                 B. any              C. little                     D. no

18. ........ walk on thegrass!

A. No                    B. Not                C. Don’t                  D. Doesn’t

19. Choose the word that has underlined part pronounced differently.

A. camp                 B. table                C. travel                 D. match

Section 2: Put the words or letters in the right order to make a complete sentence or a complete word.

1. My mother/ some stories/ bed time/ often tells me/before.

-> ……………...........................................................................................................

2. some colourful balloons/ for/ her friends/ Mary bought

-> ……………...........................................................................................................

3. My little sister/ gets/ dressed/ every morning./ at 6 o’ clock

-> ……………...........................................................................................................

4. works/ a shopkeeper/ My mother/ as/ in a flower shop.

-> ……………...........................................................................................................

5. bought/ a dictionary/ My parents/ last week./ for me

-> ……………...........................................................................................................

6. often go/ Who/ to the supermarket/ with?/ does your daugter

-> ……………...........................................................................................................

7. Mary/ the house./ with/ her parents/ often helps

-> ……………...........................................................................................................

8. like/ chicken/ very much./ My little son/ eating

-> ……………...........................................................................................................

9. at the last night’s party./ told stories/ in English/ Her students/ sang and

-> ……………...........................................................................................................

10. good/ are not/ children’s teeth./ for/ Candies

-> ……………...........................................................................................................

11. sit/ under the trees/ My friends and I/ every morning/ to read book.

-> ……………...........................................................................................................

12. plants/ Thompson/ a lot of/ has/ in her house.

-> ……………...........................................................................................................

13. in/ Are/ the days/ long/ winter?

-> ……………...........................................................................................................

14. this season./ Students/ to school/ go back/ in

-> ……………...........................................................................................................

15. How many/ big hotels/ your city?/ in/ are there

-> ……………...........................................................................................................

16. have/ you/ do/ How often/ a shower?

-> ……………...........................................................................................................

Section 3: Take a redundant letter out from each to make it correct

u n i t f o r m 

a r t m i s t

g r a y s s s t a y d i u m

p i a g n o

s e n o w

b o t i t l e m o v m e n t

l i b r a r e y

s t o p r y

c o u n a t r y

w o r e l d

n u m a b e r

b i s c h u i t

r i g h i t

e g i n f e e r

b a s t k e t

Section 4: Choose the best answer:

1. What time ............... Lan get up in the morning?

A. is           B. do                 C. does               D. are

2. My morther is at home now. She.............TV.

A. watch             B. is watching          C. watched          D. watches

3. .............. is your favourite sport?

A. What              B. Who               C. When               D. How

4. You .................. eat vegetables because they are good for your health.

A. do              B. should              C. shouldn’t                    D. B & C

5. There ................. a lot of people at my party yesterday. 

A. are             B. was                 C. were                   D. is

6. They often travel ................bus.

A. by               B. with                 C. on                       D. in

7. What .............. do next week?

A. do you                  B. did you              C. are you going to               D. A & B

8. Who .............. you meet last night?

A. did               B. are                C. do               D. does

9. ................are you going to stay?

A. What              B. Where                C. How                    D. A & B

10............... is it from here to Ha Long Bay?

A. long                B. many             C. far                      D. much

Section 5: Circle the odd out

1. went

wrote

played

clean

2. museum

place

swimming pool

school

3. spring

going

doing

swimming

4. a fever

a cough

a stomachache

a letter

5. cool

hot

weather

cold

6. stadium

yesterday

tomorrow

Monday

7. left

turn

right

ahead

8. played

stayed

listened

weekend

9. bus stop

far

airport

railway station

10. him

she

they

we

11. for

he

in

on

12. watch

listen

were

read

13. went

played

bought

talk

14. headhache         toothache                      eyes                                    fever

Section 6: Select and circle the letter A, B or C

1. What ....... the matter with you?

A. are                  B. were                 C. is

2. ................are you going tomorrow?

A. What              B. Where              C. Who

3. Did you clean the floor last Sunday?

A. Yes, Ididn’t               B. Yes, he is              C. No, I didn’t

4. What’s the weather like in summer? – It’s..................

A. warm                  B. hot                  C. cold

5. You should ............... some aspirins.

A. take              B. to take                C. taking

6. ....... you .......... to do tomorrow?

A. are – going                B. do – going                 C. did – go

7. What do you usually do ....................summer?

A. to              B. on                 C. in

8. What ............. the weather like in autumn? – It’s ...............

 A. is – hot                B. are – cool                   C. is – cool

9. What are you going to do tomorrow? – I’m going to ................ aletter

A. to write                B. write                       C writing

10. Last week, he .........fishing.

A. went                    B. goes                         C. going

11. How far is it .......... here ..........the post office?

A. to- from                B. from - in                   C. from - to

Section 7: Reorder the words to make sentences:

1. weekendnext/ Where/ you/ are/ going/ ?/

A. Where are you going to next weekend?

B. Where are you going next weekend?

C. Where you are going next weekend?

2. Turn left.on/ the right/ Post office/ is/ ./

A. Post office is on the right. Turn left.

B. Post office on is the right. Turn left.

C. Turn left. Post office is on the right.

3. dowinter/ often/ What/ you/ do/ in/ ?/

A. What do you often do in winter?

B. What do you do often in winter?

C. What often do you do in winter?

4. bestdo/ Which/ like/ you/ season/ ?/

A. Which do you like season best?

B. Which season do you best like?

C. Which season do you like best?

5. mothertook/ doctor/ me/ my/ the/ to/ ./

A. My other took me to the doctor.

B. My mother me took to the doctor.

C. My mother to took me the doctor.

6. liveMy/ London/ friends/ in/ ./

A. My live friends in London.

B. My friends live in London.

C. My friends in live London.

7. yourWhen/ father/ born/ was/ ?/

A. When was born your father?

B. When born was your father?

C. When was your father born?

8. somebuy/ food/ going/ Im/ to/ ./

A. I’m going to some buy food.

B. I’m going some to buy food.

C. I’m going to buy some food.

9. favouriteMy/ is/ school/ English/ subject/ ./

A. My favourite subject school is English.

B. My favourite school subject is English.

C. My school favourite subject is English.

10. sometimesHe/ in autumn/ goes fishing/ ./

A. He sometimes goes fishing in autumn.

B. He goes fishing sometimes in autumn.

C. He sometimes in autumn goes autumn.

Section 8: Choose the quetions for the answer:

1............................................................?

I live in Hai Duong city.

A. Where do you live?

B. Where are you live?

C. Where do live you?

2. ..........................................................?

My mother is a teacher.

A. What do your mother do?

B. What does your mother do?

C. What do your mother does?

3..........................................................?

Yes, I do. I like Vietnam food.

A. Do you like Vietnam food?

B. What do you like Vietnam food?

C. Do you Vietnam food like?

4. ........................................................?

Trang is writing a letter to her friend.

A. What do Trang doing?

B. What is Trang do?

C. What is Trang doing?

5. ........................................................?

They play football last week.

A. What do they did last week?

B. What did they do last week?

C. What they did do last week?

6. ........................................................?

Im going to Hai Phong next weekend.

A. Where are you going next weekend?

B. Where you are going next weekend?

C. Where are going you next weekend?

7........................................................?

It about 120 km from here to Do Son beach.

A. How far it is from here to Do Son beach?

B. How far is it here from to Do Son beach?

C. How far is it from here to Do Son beach?

8......................................................?

It is warm ang wet in spring.

A. What like is weather inspring?

B. What is the weather like inspring?

C. What is weather the like inspring?

9. ......................................................?

The railway station is next to the VP Bank.

A. Where is the railway station?

B. Where the railway station?

C. Where israilway station?

10......................................................?

He often go cycling in autumn.

A. What do he often do in autumn?

B. What does he often does in autumn?

C. What does he often do in autumn?

10..................................................?

Sometimes.

A. How often do they play badminton?

B. How do often they play badminton?

C. How they do often play badminton?

11.................................................?

He has a toothache.

A. What’s the matter with he?

B. What’s the matter with his?

C. What’s the matter with him?

12...............................................?

Yes, I was.

A. Was you at school yesterday?

B. Were you at school yesterday?

C. Are you at school yesterday?

13..............................................?

I went to Tuan Chau Island.

A. Where do you go last Sunday?

B. Where are you go last Sunday?

C. Where did you go last Sunday?

14............................................?

It was very interesting.

A. What was it like?

B. What does it like?

C. What is it like?

12

nhanh nha mình cần gấp

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1

15 tháng 10 2018

 bạn dịch hộ mk tu Mrs đã mk ko hiểu

15 tháng 10 2018

\(\text{Ta có:}\)

\(B=1+3+3^2+3^3+3^4+3^5+3^6+3^7+.......+3^{96}+3^{97}+3^{98}+3^{99}\)

\(=\left(1+3+3^2+3^3\right)+\left(3^4+3^5+3^6+3^7\right)+.....+\left(3^{96}+3^{97}+3^{98}+3^{99}\right)\)

\(=40+\left[3^4\left(1+3+3^2+3^3\right)\right]+.....+\left[3^{96}\left(1+3+3^2+3^3\right)\right]\)

\(=40+3^4\cdot40+....+3^{96}\cdot40\)

\(=40\left(1+3^4+....+3^{96}\right)\)

\(\Rightarrow B⋮40\)

15 tháng 10 2018

E=4^20.120-4^21.16-4^20.48 mới đứng chứ 

Nếu nhân 17 sao tính được, bạn có ghi sai đề ko?

17 tháng 10 2018

#NgôThịTô Hoàng mình không ghi sai đề đâu nhé!

15 tháng 10 2018

câu này phải lên trường khác mà hỏi chứ 

16 tháng 10 2018

Ahhh, Blinkk <3

15 tháng 10 2018

không :v

15 tháng 10 2018

trong truyện "Ông lão đánh cá và con cá vàng"

- MỤ vợ không dường lại ở  ham muốn cuối cùng

          Ý kiến đừng gạch đá