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15 tháng 2 2022

Gọi chiều dài chiều rộng thửa ruộng lần lượt a ; b ( a > b>  0 ) 

Theo bài ra ta có hpt \(\hept{\begin{cases}2\left(a+b\right)=100\\\left(a+5\right)\left(b-2\right)=ab+30\end{cases}\Leftrightarrow\hept{\begin{cases}a+b=50\\-2a+5b=40\end{cases}\Leftrightarrow}\hept{\begin{cases}a=30\\b=20\end{cases}}}\)(tm) 

Vậy chiều dài ban đầu là 30 m 

chiều rộng ban đầu là 20 m 

14 tháng 2 2022

VIII. Give the correct form of verbs.

1.They have lived in London since 1980 . (live)

2.She has worked here for two years.  (work)

3. Does John do this job ?  (do)

4.They don't live in Hanoi from 1970 to 1999 ( not live)

5. Did you put your book on my desk last night  ? (put)

6.He is studying English at this school now.  (study)

7.Our present teacher s living in this city .    (live)

8.Nobody lives in those houses. They have been empty for many years (be)

9.Cindy is in her office. She works  (work) until 7 o'clock.

10. My sister came to see my last night (come)

VII. Make questions for underlined words.1.     They are planting the trees in the garden.->................................................................................ ......... .........2. She will visit  Ha Noi  next week.->........................................................................... ......... ......... ......... ......3. She often watshes TV at 6. 45  p.m in the evening. >.................................................................................4. We go to...
Đọc tiếp

VII. Make questions for underlined words.

1.     They are planting the trees in the garden

.->................................................................................ ......... .........

2. She will visit  Ha Noi  next week.

->........................................................................... ......... ......... ......... ......

3. She often watshes TV at 6. 45  p.m in the evening. >.................................................................................

4. We go to school everyday.    ->......................................................................................................................

5. Tom and Mai are reading a book.          

-> ................................................................................. ......... ......... .......

6. All the buildings in London are old.

 -> .....................................................................................................

7. It is very cold in Sweden in the winter.

 ->..................................................................................................

8. My father was in Ha Noi last month. 

->....................................................................................................

9. She went to the doctor because she was sick.

-> ........................................................................................

10. Nam left home at 7 o'clock yesterday. ->..................................................................................................     

11. My future house will be on the ocean.

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

12. She goes to the fitness center three times a week. ->.....................................................................................

13. They joined the environment project last Sunday. ->.....................................................................................

14.Our class has Geography on Monday.

 >....................................................................................

 

15.We will travel to the moon by a super car. >....................................................................................

nhanh nha các bạn , mai thi rồi

1
11 tháng 3 2022

1. Where are they planting the trees?

2. When will she visit Ha Noi?

3. When does she often watch TV?

4. How often do we go to school?

5. What are Tom and Mai doing?

6. How are all the buildings in London?

7. How is it in Sweden in the winter?

8. Where was your father last month?

9. Why did she go to the doctor?

10. When did Nam left home yesterday?

11. Where will your future house be?

12. How often does she go to the fitness centre. 

13. When did they join the environment project?

14. What does our class have on Monday?

15. Where will we travel to by a super car?

14 tháng 2 2022

1 She s reading books.

2 He lives far from the school.

3 They might have robots to do their housework in the future.

4 No lake in Ha Noi is larger than West Lake

Đúng thì k mình nhé.Chúc bạn học tốt

14 tháng 2 2022

1.She is interested in reading books..

          She s     …reading books……………

2.We live near the school, but he doesn’t.

      He lives ....far the school..............................................................................................................

3.They will probably have robots to do their housework in the future.

       They might................have robots to do their housework in the future................................................................................................

4. The West Lake is the largest one in Ha Noi.

No lake in Ha Noi is larger than West Lake./ No lake in Ha Noi is as large as West Lake.

II. Choose the best answer (A,B, C or D) to complete each sentence below (2.0 points)1. How long does it take to go to the nearest museum? -  “ __________”.A. No, it isn’t far B. Yes, it is a long way C. I’m sorry, I don’t know D. Why do you ask me?2. ___________ are you still watching TV? A. Why        B. What  C. Where    D. Who3. Do you often help your mother to ______ the housework?A. make                         B....
Đọc tiếp

II. Choose the best answer (A,B, C or D) to complete each sentence below (2.0 points)

1. How long does it take to go to the nearest museum? -  “ __________”.

A. No, it isn’t far B. Yes, it is a long way C. I’m sorry, I don’t know D. Why do you ask me?

2. ___________ are you still watching TV? A. Why        B. What  C. Where    D. Who

3. Do you often help your mother to ______ the housework?

A. make                         B. play                           C. do                    D. get

4. What _________ exciting city!

A. a                                B. the                   C. an                    D. A& C

5. My mother cooked noodles for me ________ I was hungry.

 

A. because            B. and                            C. although                    D. but

nhanh nha các bạn , mình mai thi rồi 

1
14 tháng 2 2022

1a nhé'

I. Choose the word which has a different sound in the part underlined. (1.0 point)1. A. delicious                B. like                            C. nice                           D. fine2. A. extended                B. visited                          C. jumped                             D. started3. A. picks                     B. spends...
Đọc tiếp

I. Choose the word which has a different sound in the part underlined. (1.0 point)

1. A. delicious                B. like                            C. nice                           D. fine

2. A. extended                B. visited                          C. jumped                             D. started

3. A. picks                     B. spends                         C. follows                   D. cleans

4. A. gather                     B. think                            C. this                         D. although

 

5. A. hear                       B. speak                           C. clean                        D. beach

nhanh nha các bạn

1
20 tháng 2 2022

1.A

2.C

3.A

4.B

14 tháng 2 2022

c. Do_do

d. speak

học tốt>.<

14 tháng 2 2022

a. (1. Not go) Don't go out now! It (2. rain) is raining.

b.We (3. watch) watched an interesting program on television last night.

c. Do They often (4. do) do their homework after dinner?

d. She can (speak) speak English well.

14 tháng 2 2022

Đổi 8h20′=8/13h

Gọi khoảng cách từ nhà An tới nhà Bình là x (km, x > 0)

Khi Bình bắt đầu đi thì An đã đi được số ki-lô-mét là:  (8/13−8).4=4/3(km)

Tổng vận tốc của hai bạn là : 4 + 3 = 7 (km)

Thời gian để hai bạn gặp nhau kể từ khi Bình đi là:  x−4/37=3

Khi đó quãng đường Bình đi được là: 3.3x−421=3x−4/7(km)

Sau khi hai bạn gặp nhau thì lại quay về nhà Bình nên quãng đường Bình đi là: 3x−47.2=6x−8/7(km)

m)

An đi tới nhà Bình rồi quay lại nhà mình nên quãng đường An đi bằng 2 lần khoảng cách giữa nhà hai bạn và bằng 2x Theo bài ra ta có phương trình:

2x=4.(6x−87)2x=4.(6x−87)

⇔14x=24x−32⇔x=3,2(km)

Vậy khoảng cách từ nhà An tới nhà Bình là 3,2 km.

14 tháng 2 2022

TL:

khoảng cách từ nhà An tới nhà Bích là 3,2 km.

HT

14 tháng 2 2022

hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhaaaaa

14 tháng 2 2022

Vẽ các đường cao AI; BJ; CK của \(_{\Delta}\)ABC

NM = BC => BM = CN

Ta thấy: \(_{\Delta}\) vuông BHK ᔕ \(\Delta\) Vuông CHJ nên:

\(\frac{BK}{JC}=\frac{HK}{HJ}\left(1\right)\)

BJ // MD và CK // NE nên :

\(\frac{JC}{Jb}=\frac{BC}{BM}=\frac{BC}{CN}=\frac{BK}{KE}\)

\(=>\frac{KE}{Jb}=\frac{BK}{JC}\left(2\right)\)

Từ (1) và (2) => \(\frac{KE}{Jb}=\frac{HK}{JH}\)=> \(\Delta\) vuông EKH ᔕ \(\Delta\) vuông DJH

\(=>\hat{HEK}=\hat{HDJ}=>\hat{AEH}+\hat{HDJ}=180^0\left(đpcm\right)\)

mình không vẽ hình vì sợ bị duyệt nên lamf thê snayf cho nhanh