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1. It's such a pity your sister can't come as wellIf only..2. The house seemed to have been unoccupied for several monthsIt looked3. These new machines put an end to queuingBefore these 4.He was so tired he fell asleep before the end of the filmHe was too.5. Though my house was cheaper than Norman's, it's bigger and more attractive.Norman's house may6. Everyone heard about the accident before I didI was the 7."If you must go out tonight, at least finish your homework first" said Sarah's...
Đọc tiếp

1. It's such a pity your sister can't come as well
If only..
2. The house seemed to have been unoccupied for several months
It looked
3. These new machines put an end to queuing
Before these 

4.He was so tired he fell asleep before the end of the film
He was too.
5. Though my house was cheaper than Norman's, it's bigger and more attractive.
Norman's house may

6. Everyone heard about the accident before I did
I was the 
7."If you must go out tonight, at least finish your homework first" said Sarah's father
Sarah's father said that if 
8. The instructions say you just add boiling water to the soup powder
The soup powder 
9. Many people were severely critical of the proposals for the new motorway
There was 
10. For a teacher of her experience and ability, discipline was not a problem
For such 
11. There was no precedent for the King's resignation
Never 
12. The police were informed of the identity of the murdered man
The identity
13. The fate of the two climbers is unknown
It is a mystery.
14. He was suspended for two matches for swearing at the referee
Swearing at the referee earned 
15. Although he was not guilty they excuted him
In spite of 
16. People who haven't been abroad shouldn't criticise foreign customs.
Nobody who
17. The only way to elimate world terrorism is by united opposition
Only by.
18. If she hadn't insisted on kissing everyone goodbye she would have caught the train
If it hadn't 
19. The fisherman's life was one of great povert
Throughout 
20. Someone has suggested abolishing income tax
It

1
30 tháng 7 2021

1. It's such a pity your sister can't come as well
If only your sister could come as well.
2. The house seemed to have been unoccupied for several months
It looked as if the house had been unoccupied for several months. 
3. These new machines put an end to queuing
Before these machines were invented, people had had to queue.

4.He was so tired he fell asleep before the end of the film
He was too  tired to fell asleep before the end of the film
5. Though my house was cheaper than Norman's, it's bigger and more attractive.
Norman's house may have been more expensive than mine but it’s smaller and less attractive.

 

6. Everyone heard about the accident before I did
I was the last person to hear for the accident.
7."If you must go out tonight, at least finish your homework first" said Sarah's father
Sarah's father said that if  she had to go out that night, she must finish her homework first
8. The instructions say you just add boiling water to the soup powder
The soup powder  is said to be added boiling water.
9. Many people were severely critical of the proposals for the new motorway
There was severe criticism of proposals for the new motorway
10. For a teacher of her experience and ability, discipline was not a problem
For such an experienced and ableteacher like her , discipline was not a problem
11. There was no precedent for the King's resignation
Never before had any King resigned
12. The police were informed of the identity of the murdered man
The identity of the murder man was informed by police
13. The fate of the two climbers is unknown
It is a mystery. about/of what has happened to the two climbers
14. He was suspended for two matches for swearing at the referee
Swearing at the referee earned him a two-match suspension
15. Although he was not guilty they excuted him
In spite of his being guiltless, they executed him
16. People who haven't been abroad shouldn't criticise foreign customs.
Nobody who has been abroad shouldn't criticize foreign customs
17. The only way to elimate world terrorism is by united opposition
Only by. united opposition is the world terrorism eliminated
18. If she hadn't insisted on kissing everyone goodbye she would have caught the train
If it hadn't been for her insisting on kissing everyone goodbye, she would have caught the train
19. The fisherman's life was one of great povert
Throughout his life, the fisherman was very poor.​
20. Someone has suggested abolishing income tax
It has been suggested that income tax (should) be abolished

 

1: \(\dfrac{x-3}{x+1}=\dfrac{x^2}{x^2-1}\)

=>(x-3)(x-1)=x^2

=>x^2=x^2-4x+3

=>-4x+3=0

=>x=3/4

2: \(\dfrac{5}{3x+2}=2x-1\)

=>(2x-1)(3x+2)=5

=>6x^2+4x-3x-2-5=0

=>6x^2+x-7=0

=>6x^2+7x-6x-7=0

=>(6x+7)(x-1)=0

=>x=1hoặc x=-7/6

1: \(\dfrac{x}{3}-\dfrac{2x+1}{2}=x-6-x\)

=>2x-3(2x+1)=-36

=>2x-6x-3=-36

=>-4x=-33

=>x=33/4

2: \(3x-15=2x\left(x-5\right)\)

=>(x-5)(2x-3)=0

=>x=3/2 hoặc x=5

3: \(\dfrac{x+3}{x+1}+\dfrac{x-2}{x}=2\)

=>x(x+3)+(x-2)(x+1)=2x(x+1)

=>x^2+3x+x^2+x-2-2x^2-2x=0

=>2x-2=0

=>x=1

2 tháng 8 2015

Mấy câu trên lúc nãy giải rồi đó

f) Gỉa sử lấy ra trường hợp xấu nhất:  30 đen & 20 xah & 1 đỏ

Phải lấy thêm 1 viên nữa để chắc chắn có 2 xah 2 đỏ 2 đen

Phải lấy tất cả 52 cái

Nhấn đúng cho mk nah1!!!!!!!!!!!!

2 tháng 8 2015

Xấu nhất :  30 đen 20 xanh và 1 đỏ

  Phải lấy thêm 1 cái nữa để chắc chắn có ít nhất 2 xanh 2 đỏ 2 đen

Vậy phải lấy: 52 cái

2 tháng 8 2015

a) Nếu ta lấy ra trường hợp xấu nhất :  20 xanh & 30 đen

 Phải rút ra 1 chiếc nữa để chắc chắn 1 bút có màu đỏ

=> 51 cái

b) Nếu ta lấy ra trường hợp xấu nhất :  10 đỏ & 30 đen

 Phải rút ra 1 chiếc nữa để chắc chắn 1 bút có màu xanh

=> 41 cái

c) Nếu ta lấy ra trường hợp xấu nhất :  10 đỏ & 20 xanh

 Phải rút ra 1 chiếc nữa để chắc chắn 1 bút có màu đen

=> 31 cái

d) Nếu ta lấy ra trường hợp xấu nhất :  1 xanh & 1 đen & 1 đỏ

 Phải rút ra 1 chiếc nữa để chắc chắn 2 bút cùng màu

=> 4 cái

e) Nếu ta lấy ra trường hợp xấu nhất :  20 xanh & 30 đen

 Phải rút ra 1 chiếc nữa để chắc chắn 1 bút có màu đỏ & xanh & đen

=> 51 cái

g) Nếu ta lấy ra trường hợp xấu nhất :  20 xanh & 30 đen & 1 đỏ

 Phải rút ra 1 chiếc nữa để chắc chắn 2 bút có màu đỏ

=> 52 cái

Nhấn đúng cho mk nha!!!!!!!!!!!

2 tháng 8 2015

a)51

b)41

c)31

d)31

e)51

g)52      

31 tháng 7 2015

bạn học lớp 5 đúng ko bạn có sách bd toán 5  trong đó có bài này bạn nhìn đáp án viết lên đây là xong

nếu biết đáp án vậy bạn trình bày cách làm đi

19 tháng 2 2018

Nguyễn Thị Thu Hiền gian lận điểm hỏi đáp !!!

(Ph2 phản chứng).Vì các góc ko =nhau nên ta chỉ xét 2 TH:

   *TH1:tất cả các góc đều nhọn =>vô lý

   *TH2:_______________ tù =>vô lý

     (Các bạn tự xét nhé !).Vậy ...(đpcm)

29 tháng 5 2019

Tổng 4 góc của 1 tứ giác = 360 độ

=> Nếu 4 góc bằng nhau thì mỗi góc = 90 độ.

Mà tứ giác đó 4 góc không bằng nhau

=> có ít nhất một góc lớn hơn 90 độ và 1 góc bé hơn 90 độ hay có ít nhất 1 góc nhọn và 1 góc tù 

26 tháng 1 2016

.........( tự hiểu)....