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Gọi số cần tìm là abc2 .Khi xóa chữ số 2 ở hàng đơn vị của số đó thì ta được số abc .Theo đề bài ta có:
abc+2342=abc2
abc+2342=abc x 10+2
abc+2342-2=abc x 10
abc+2340=abc x 10
2340=abc x 10-ab
abc x 10-abc x 1=2340
abc x(10-1)=2340
abc x 9=2340
abc=2340:9
abc=260 => abc2=2602
Vậy số cần tìm là: 2602

5. They (play) .........played.................. football eacs other last week

6. Yesterday, I (get) .....was getting................ up at 6 and (have) ...............was having............. breackfast at 6. 30

1.as/cool/immediately/the/burn/so/to/tissue/damage/minimize

Cool the burn immediatly so as to minimize tissue damage

2.part/put/affected/a/cold/the/tap/under/running

Put the afftected part under a running cold tap

3.burned/cover/sterile/area/with/a/dressing/the/thick

Cover the burned area with a thick sterile dressing

4.clean/water/the/victim's wound/soap/with/warm/and

Clean the victim's wound with soap and warm water

5.give/soon/the/cictim/an anti-tetanus/as/as/possible/injection

Give the victim an anti-tetanus injection as soon as possible

6.the/of/patient's feet/or/lower/his/below/the/level/the/heart/alevate/head

Alevate the patient's feet or lower his head below the level of the heart

7.give/when/the/a/cup/revies/of/tea/he/victim

Give the victim a cup of tea when he revies

8.don't/drugs/the/victim/or/alcohol/give

Don't give the victim drugs or alcohol

9.don't/chilled/ley/the/become/victim

Don't let the victim become chilled

10.don't/the/to/sit/or/force/victim/stand

Don't force the victim to sit or stand

1, Where is the nearest post office?

=> Could you show me the way to the nearest post ofice?

2, Open the door, please.

=> Will you open the door?

3, Hanh is studying very hard because she doesn't want to fail in the exam

=> Hanh is studying very hard in order not to fail in the exam.

4, Do you want me to drive?

=> Shall I drive ?

5, I want you to help me carry my bags

=> Can you carry my bags ?

6, He climbed the tree because he wanted to get a better view

=> He climbed the tree so as to get a better view.

7. I went to the college I wanted to see Professor Taylor.

==> I went to the college in order to see Professor Taylor

8. He moved to the front row. He could hear the speaker better.

==> He moved to the front row so as to hear the speaker better.

9. We hurried to School. We didn't want to be late.

==> We hurried to School in order not to be late.

10. We turned out the lights. We didn't want to waste electricity.

==> We turned out the light so as to waste electricity.

11. Nam is studing very hard. He wants to keep pace with his classmate.

==> Nam studying very hard in order to keep pace with his classmate.

4n-5 chia hết cho 2n-1 thì 2n-1 chia hết cho 2n-1 

Ta có: (4n-5)-2.(2n-1)

         = (4n-5)-(4n-2)

         =4n-5-4n+4

         =-1

Vậy Ư(-1)=2n-1

Mà Ư(-1)={-1;1} nên 2n-1=1

2n-1=1

2n=1+1

2n=2

n=2:2=1

Vậy n=1

Do they speak French and English in Canada.

- Are French and English spoken in Canada

We/delighted/get/your letter/yesterday.

- We was delighted to get your letter yesterday.

It/not easy/answer/these questions.

- It is not easy to answer these questions.

Your writing/diffcult/read.

- Your writing is diffcult to read.

I/surprised/see/Paul/the party/last night.

- I was surprised to see Paul at the party last night.

Can I move the refrigerator to the right corner.

-Would you like to move the refrigerator to the right corner?

Could I borrow your newspaper.

-Do you mind borrowing your newspaper.

Do you mind if I close the door.

-Would you mind if I closed the door

They will clean the floor tomorrow.

-The floor will be cleaned tomorrow

It is easy to learn English.

-To learn English is easy

I saw you again so I am very glad.

-I am very glad to see you again

They dry the glass pieces completely.

-The glass pieces are dried completely

Somebody cleans the room everyday.

- the room is cleaned everyday.

Your teacher must sign this form.

-this form must be signed by your teacher

Will you invite her to your birthday party

-Will she be invited to your birthday party

We can't wear jeans at work.

-Jeans can't be worn at work

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1. Remember to fill ……in……….the medical form.

2. Vietnamese people always set the table ……with………..bowls, plates and chopsticks.

3. My aunt tells us a lot………about…………..you.

4. Hoa tried ……on………the new dress but it didn’t fit.

5. Do you often help your parents ……with…………….the housework?

6. What was wrong ………with…………..Hoa?

7. Millions ……of………..people catch the common cold every year.

8. My brother often goes to work …………on…………foot.

9. How often do you write letters ………to………your parents?

10. Mr. Lam is very keen ……on…………reparing things.