Ta có:x chia hết cho x-1

=>x-1+1 chia hết cho x-1

Mà x-1 chia hết cho x-1

=>1 chia hết cho x-1

=>x-1\(\in\)Ư(1)={-1,1}

=>x\(\in\){0,2}

Vì x lớn nhất nên x=2

1. Paul’s drunkenness lost him the job. Unless he _____ so often, he ________ sacked.

A. drank/wouldn’t be B. had drunk/wouldn’t have been

C. hadn’t drunk/would have been D. would drink/hadn’t been

2. My new neighbor has two children, ____________ are very lovely.

A. both of whom B. all of whom C. who both of D. both of that

3. Schooling is compulsory for all Vietnamese children ___________ from six to fourteen.

A. age B. aged C. at age D. on age

4. This room is _________________________________________________.

A. too small for us to work in B. so small that we can’t work in

C. not big enough for us to live in it D. such small room that we can’t live in it

5. This student is determined to be the best student ____________________________.

A. so as his parents to be proud of him B. in order to be proud of his parents

C. in order for his parents will proud of him D. so that his parents will be proud of him

6. American men rarely shake hands when __________________________________.

A. they are introduced B. they say hello

C. they say goodbye D. they are the hosts

7. Paul: Mary, this is Mr.Baker. –Mary (to Mr.Baker): ________________________.

A. How are you? B. How do you do C. Hello D. Hi

8. Tom promised us that he ___________ us as soon as he _________________ a hotel.

A. would call / had found B. would call / would find

C. had called / had found D. called / would have found

9. Tom is thought ___________ the runaway murderer last week.

A. to meet B. to be met C. to have met D. that he met

10. ____________ all the evidence, the man denied having stolen the motorbike.

A. As a result of B. Even if C. Due to D. Despite

11. They don’t allow ________________ here.

A. to take photographs B. taking photographs

C. photographs to take D. photographs taking

12. My sister wishes she __________ to play the piano when she was young.

A. learnt B. would have learnt C. had learnt D. would learn

13. We must ____________ traffic coming from the right.

A. make use of B. take note of C. give way to D. catch sight of

Ư(13)={1;13}

2668:x+1392:x+1972:x = 104 

x=58

CHU VI HÌNH TRÒN LÀ:

3x2x3,14=18,84(dm)

DIỆN TÍCH HÌNH TRÒN LÀ: 

3x3x3,14 = 28,26(dm2)

Cau 1: 124

Cau 2:524,5

cho minh nhe

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