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nguyễn hương trang
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Bùi Minh Hằng
17 tháng 3 2016 lúc 22:10

Vì (n+7) chia hết cho (n+5)

Nên [(n+5)+2] chia hết cho (n+5)

Mà (n+5) chia hết cho (n+5)

Suy ra, 2 chia hết cho (n+5)

Suy ra,(n+5) là Ư(2)

Ư(2)={-2;-1;1;2}

Vậy tập hợp các giá trị n là { -7;-6;-4;-3}

Vũ Bích Phượng
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1. Letters are typed in the office by Mary.

2. You’ll be helped by his father tomorrow.

3. The human life has completely been changed with science and technology.

4. This bottle was broken by Peter.

5. English is being learnt in the room.

6. My mind can’t be changed.

7. I hadn’t been told about it.

8. Her telephone number isn’t known.

9. The children will be brought home by my students.

10. I was sent a present last week.

11. We were given more information.

12. All the workers of the plan were being instructed by the chief engineer.

13. Tea can’t be made with cold water.

14. Some of my books have been taken away.

15. The meeting will be held before May Day.

16. The engine of the car has to be repaired.

17. The window was broken and some pictures were taken away by the boys.

18. A lot of money is spent on advertising every day.

19. A story is going to be told by teacher.

20. A cake is being cut with a sharp knife by Mary.

21. The woman with a red hat was looked at by the children.

22. The victims have been provided with food and clothing.

23. English is spoken in almost every corner of the world.

24. This machine mustn’t be used after 5:30 p.m.

25. After class, the chalk board is always erased by one of the students.

26. Is English taught here?

27. Will she be invited to your wedding party?

28. Has the work been finished by Tom?

29. Were some exercises given by the teacher?

30. Has the window of the laboratory been changed?

Cre: gg

#Jen



 

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Nguyễn Ngọc Diệp
4 tháng 12 2021 lúc 13:22
1. Letters are typed in the office by Mary.2. You’ll be helped by his father tomorrow.3. The human life has completely been changed with science and technology.4. This bottle was broken by Peter.5. English is being learnt in the room.6. My mind can’t be changed.7. I hadn’t been told about it.8. Her telephone number isn’t known.9. The children will be brought hnh độ tiếng Anh lớp 4 số 1ome by my students.10. I was sent a present last week.11. We were given more information.12. All the workers of the plan were being instructed by the chief engineer.13. Tea can’t be made with cold water.14. Some of my books have been taken away.15. The meeting will be held before May Day.16. The engine of the car has to be repaired.17. The window was broken and some pictures were taken away by the boys.18. A lot of money is spent on advertising every day.19. A story is going to be told by teacher.20. A cake is being cut with a sharp knife by Mary.21. The woman with a red hat was looked at by the children.22. The victims have been provided with food and clothing.23. English is spoken in almost every corner of the world.24. This machine mustn’t be used after 5:30 p.m.25. After class, the chalk board is always erased by one of the students.26. This dish is brought to me (by the waiter).27. These postcards are sent to us(by our friend).28. This story was told to them(by their grandmother) when they visited her last week.29. This train ket was ordered for Tim's mother.20. The special cameras weren't showed to me.

@sherry 

HT~~~(^^)

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Trần Bảo Minh Thư
4 tháng 12 2021 lúc 13:32
Tom gets the room cleaned by his brother.Nina had her assignment typed by a friend.Eli will have her hair cut by a hairdresser.They had the thief arrested by the police.Are you going to have your washing machine repaired by the mechanic?I must have my back checked by the doctor.She will have milk bought by John tomorrow.I have the story told by him again.The new grammar was copied into her notebook by the student.Several tourists have been attacked by monkeys in Nha Trang.The chair was moved into the bedroom. Some cake and candies were given to Lily by Tommy.A new car is going to be bought by my parents next year. When will your homework be done? When is your hair going to be cut?Who was that letter sent by?Is a textbook brought by Anna?I wonder whether Elise or Beth will be chosen for the position by the interviewer. Why wasn’t he helped?How can that door be opened?Is French taught here?Has a new dress for your party this weekend been bought?Must be the room cleaned before 3pm?                                                                                                                                               xl bn nhưng mik chỉ tìm đc thế thôi
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VY ~ VY ( team xấu nhưng...
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.
5 tháng 7 2021 lúc 8:41

a, Ta có: \(2x+4⋮x-2\)

\(\Rightarrow2x-4+8⋮x-2\)

\(\Rightarrow2\left(x-2\right)+8⋮x-2\)

\(\Rightarrow8⋮x-2\)

\(\Rightarrow x-2\inƯ\left(8\right)=\left\{\pm1;\pm2;\pm4;\pm8\right\}\)

\(\Rightarrow x\in\left\{1;3;0;4;6;-2;10;-6\right\}\)

Vì \(x\inℕ\) nên \(x\in\left\{0;1;3;4;6;10\right\}\)

b, Ta có: \(15-2x⋮x+1\)

\(\Rightarrow17-2x-2⋮x+1\)

\(\Rightarrow17-2\left(x+1\right)⋮x+1\)

\(\Rightarrow17⋮x+1\)

\(\Rightarrow x+1\inƯ\left(17\right)=\left\{\pm1;\pm17\right\}\)

\(\Rightarrow x\in\left\{-2;0;16;-18\right\}\)

\(\Rightarrow x\in\left\{0;16\right\}\) thỏa mãn \(x\inℕ\)

Khách vãng lai đã xóa

a.         Ta có: 2x+4 chia hết cho x-2

                       x-2 chia hết cho x-2 => 2.(x-2)=2x-4 chia hết cho x-2

                      => (2x+4)-(2x-4) chia hết cho x-2

                      => 2x+4-2x+4 chia hết cho x-2

                      => 8 chia hết cho x-2

                      => x-2 thuộc U(8)={1; 2; 4; 8}

                      => x thuộc {3; 4; 6; 10}

           Vậy x thuộc {3; 4; 6; 10}

b. Ta có: 15-2x chia hết cho x+1

               x+1 chia hết cho x+1 => 2(x+1)=2x+2 chia hết cho x+1

         => (15-2x)+(2x+2) chia hết cho x+1

         => 15-2x+2x+2 chia hết cho x+1

         => 17 chia hết cho x+1

         => x+1 thuộc U(17)={1; 17}

         => x thuộc {0; 16}

     Vậy x thuộc {0;16}

                                                                    CHÚC PN HOK TỐT

             

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LONGKAKA
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trương ngọc anh thư
29 tháng 1 2019 lúc 14:33

happy new year

ㅔㅗㅕㅐㅜ흐ㅛ
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_____Teexu_____  Cosplay...
28 tháng 4 2019 lúc 20:32

0,25 = 1/4 

Tổng số phần bằng nhau : 1 + 4 = 5 

Số bé là : 0,25 : 5 x 1 = 0,05

số lớn là : 

0,25 - 0,05 = 0,2 

đ/s : Số bé : .......

lớn : ...........

Đặng Đình Tùng
28 tháng 4 2019 lúc 20:34

Bài làm

Đổi 0,25 = 25%

Số bé là :

    0,25 : ( 100 + 25 ) . 25 = 0,05

Số lớn là :

    0,25 - 0,05 = 0,2

              Đáp số : Số bé : 0,05

                            Số lớn : 0,2

Nguyễn Minh Đức
28 tháng 4 2019 lúc 20:39

Đổi 0,25 = \(\frac{1}{4}\)

Số bé là:

0,25 : ( 1 + 4 ) x 1 = 0,05

Số lớn là:

0,25 - 0,05 = 0,2

Đáp số: Số bé: 0,05

             Số lớn: 0,2

Nguyển Văn An
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Nguyển Văn An
21 tháng 7 2016 lúc 6:25

hu hu chưa ai làm được sao

Nguyển Văn An
21 tháng 7 2016 lúc 7:04

đáp án là (1-1/2)+(1/2-1/3)+(1/3-1/4)+......+(1/2006-1/2007)vì các vế trừ 1/2 lại cộng 1/2, trừ 1/3 lại cộng 1/3 nên cuối cùng ta còn lại:

1-1/2007 sẽ có kết quả là 2006/2007

tran thi huong
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QUỲNH TRÂM
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thùy dương 08-617
19 tháng 10 2021 lúc 15:57

Được luôn em ơi có gì hỏi chị nha

chuche
19 tháng 10 2021 lúc 15:58

ok bn êi

Dương Khánh Giang
21 tháng 10 2021 lúc 11:35

mik hôm nay mới vào luôn

Lê Minh Huy
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Sherlockichi Kazukosho
12 tháng 8 2016 lúc 14:32

\(5^{2.x+1}=125\)

\(\Rightarrow5^{2x}.5=125\)

\(\Rightarrow5^{2x}=25\)

\(\Rightarrow25^x=25\)

\(\Rightarrow x=1\)

Nguyễn Phương Trung
12 tháng 8 2016 lúc 14:36

=>\(5^{2x}.5=125\)

=>\(5^{2x}=25\)

=> \(25^x=25\Rightarrow x=1\)

Lê Ngọc Mai
12 tháng 8 2016 lúc 14:38

     \(5^{2x+1=125}\)

\(\Rightarrow5^{2x+1}=5^3\)

\(\Rightarrow2x+1=3\)

\(\Rightarrow2x=2\)

\(\Rightarrow x=1\)

Chúc bạn lam bài tốt nhé !