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15 tháng 4 2021

1 If there were a library in my neighborhood, I could borrow books

2 If I had much free time, I could come to your party

3 If she were a bird, she could fly anywhere

4 Ì you don't study hard, you will fail the test

5 The castle was haunted so we were so scared

6 Despite the bad weather, the football match went on

7 Before she worked in this company, she had been married

 

 

15 tháng 4 2021

8 Because of the dangerous acid rain, the leaves of many plants are damaged

9 Unless you try your best, the result will not be good

10 Because of the heavy rain, the match was cancelled

11 I haven't been to Bang Kok before

12 I have learnt English for 10 years

13 After having done some exercise, Kathy had a shower

14 The last time we talked to each other was 2 weeks ago

12 tháng 2 2022

Refer:

Fill in an appropriate word in each blank.

Kipling was the first writer (1) was expressed the faith and national pride. He was (2) born in Bombay India (3) in 1865 and was taken (4) to England to (5) be educated at the (6) age of 6. But at the age of 17 he returned (7) to India and became a journalist. (8) by this time he (9) was a great amount of prose and portry. After wards he returned to England and travelled in Japan and America. He received the 1907 Nobel (10) prize for literature and died in 1936 while he was working on his autbiographical notes.

12 tháng 2 2022

who - born - in - to - be - age - to - by - was - prize

12 tháng 10 2021

bn làm r mà.

16 tháng 11 2021

m, cf m fcmk

Em ơi đăng tách bài ra mỗi lượt đăng 1-2 bài thôi nha!

9 tháng 8 2018

\(B=\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+...+\frac{1}{132}\)

\(B=\frac{1}{4\cdot5}+\frac{1}{5\cdot6}+\frac{1}{6\cdot7}+...+\frac{1}{11\cdot12}\)

\(B=\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+...+\frac{1}{11}-\frac{1}{12}\)

\(B=\frac{1}{4}-\frac{1}{12}\)

\(B=\frac{1}{6}\)

9 tháng 8 2018

Tính nhanh : 

B = 1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90 + 1/110 + 1/132 

B = 1/4.5 + 1/5.6 + 1/6.7 + 1/7.8 + 1/8.9 + 1/9.10 + 1/10.11 + 1/11.12

B = 1/4 - 1/5 + 1/5 - 1/6 + 1/6 - 1/7 + 1/7 - 1/8 + ...... + 1/11 - 1/12

B = 1/4 - 1/12

B = 3/12  - 1/12

B = 2/12

B = 1/6 

6 tháng 2 2022

1. How => When

2. Why => How

3. How much => Why

4. Where => What

5. What time => How many days

6. Whom => Whose

7. What => Which

8. Why => Where

9. How => Who

10. Who => What

11. Where => When

12. When => Why

13. Why => How

14. How much => How long

15. Where => How far

28 tháng 11 2016

mk cũng ko bik nữa

28 tháng 11 2016

hiện tại HOC24 vx chưa có chức năng này néh bn

25 tháng 5 2018

a,Đoạn thẳng chứ nhỉ??

*Công thức:  \(\frac{n\left(n+1\right)}{2}\)

_Giải:

-Ta có: 2 điểm vẽ 1 đt

=> n điểm sẽ vẽ đc n-1 đt

-Lược bỏ những đt trùng nhau

=>Số đt có là: [n(n-1)]/2(đoạn thẳng)

b/

-Ta có:  \(\hept{\begin{cases}5\widehat{B}+\widehat{A}=180^o\left(1\right)\\2\widehat{B}+\widehat{A}=90^o\left(2\right)\end{cases}}\)

-Lấy: (1) trừ (2) vế theo vế.

-Ta được: \(\hept{\begin{cases}3\widehat{B}=90^0\\\widehat{A}=90^0-2\widehat{B}\end{cases}\Leftrightarrow\hept{\begin{cases}\widehat{B}=30^0\\\widehat{A}=90^0-60^0=30^0\end{cases}}}\)

-Vậy: \(\widehat{A}=\widehat{B}=30^0\)