Let

x = the cost of one loaf of bread

y = the cost of one roll

One loaf of bread and six rolls cost $1.80:

x + 6y = 1.80

Two loaves of bread and four rolls cost $2.40:

2x + 4y = 2.40

We have the system of equations:

x + 6y = 1.80

2x + 4y = 2.40

x = $0.90

y = $1.15

chắc vậy đó bn.mk hok ngu có sai thông cảm nhé

Một ổ bánh mì và sáu cuộn bánh có giá 1,80 đô la. Với mức giá như nhau, hai ổ bánh mì và 4 cuộn bánh có giá 2,40 đô la. 1 ổ bánh mì giá bao nhiêu?

giải luôn ra chứ ko pải dịch đâu nha bn (chú ý giải = tiếng Anh nha)

I.       Find the mistake and correct it .

27.    Are you  exciting about your holiday?                   exciting => excited 

28.    How much is one banana cost?                                   is => does

II.      Supply the correct tense or form of the verbs in brackets.

29.    We learn how (use)……to use……………………… a computer in Computer Science class.

30.    Ba is good at (fix) ……fixing……………… household appliances.

31.    His teacher says, “ you (be) ……will be………………a great artist one day”

32.    What (the boys / play) …………………are the boys playing……………………………….at the moment?

III.     Supply the correct form of the word. 

33.    American students take part in different ……activities…………………… at recess. (act)

34.    ……Eating…………………. and talking are the most common way of relaxing at recess. (eat)

35.    Mai thinks geography is ………difficult………………….. (difficulty)

36.    Leonardo da Vinci (1452 – 1519) is one of the world’s ……..……famous…………artists. He created rare masterpieces of art such as ‘The Mona Lisa’ and The Last Supper.’(fame)

15 pens cost:

(15000 : 5). 15 = 45000 (đ)

7 pencils cost:

59000 - 45000 = 14000 (đ)

One pencil costs:

14000 : 7 = 2000 (đ)

16. “____________?” – “It’s 20.000 dong” (How much is this parcel cost / How much does this parcel take / How much does this parcel / How much does this parcel cost)

    17. This person is short and thin. She has…………….. hair.  (a long black/ black long/ black short/long black)

18. They have studied ______ three hours. (for / at / since / to)

19. He does morning exercises regularly in order to ______ his health. (have / improve / get / take)

20. Don’t let your child ______ with matches. (playing / to play / plays / play)

21. They ______ from Canada to America to find work. (started / demonstrated / delivered / migrated)

22. Last night I watched the movie Romeo and Juliet. At last they killed ______. (together/ each other/ themselves / one another)

23. My mother is ______ tired ______ cook tonight. (enough – to / too – to / so – that / very – to)

24. He went to school late because he was stuck in the ______ this morning.(rush-hour / traffic-light / traffic-jam / cross-road)

25. Airmail is ______ expensive than surface mail. (the most / most / much / more)

27. Ho Chi Minh Communist Youth Union is an ………….for Vietnamese teenagers.   (organizational/                          organizationally/ organization/ organizatic)

28. John came ______ an old school friend in the street this morning. (with / along / across / off)

29. She asked her children ______ (to stop playing / stop to play / stop playing / stopping to play)

30. He is not ______ ride a motorbike. (enough old to / enough old for / old enough to / old enough for)

1 D

2 C

3 A

D

C

A

1. D

2. C

3. A

1. at -> bỏ

2. to play -> playing

3 costs -> costs

4. in -> bỏ

5 are playing -> play

6 as -> ike

7 scientific -> science

8 coming -> to come

9 less -> fewer

10 many -> bỏ

Do you know how much does a banana cost ?

tick nhe

Do you know how much a banana cost ?

=> Do you know how much a banana ?

Mk chắc chắn vì mk cũng đã từng làm một lần và đã đúng với đáp án ấy .

Trong câu này có 2 mệnh đề : một phụ và một chính , cái chính là câu hỏi , còn phụ chỉ là câu hỏi phụ nên cost phải bỏ đi !

Còn bạn tick hay không , không quan trọng đó là ý kiến riêng của mk thôi , mk ko quan tâm

cost chuyển thành costs

1. at → ∅

2. to play → playing

3. cost → costs 

4. less → fewer

5. many → ∅

1. at → ∅

2. to play → playing

3. cost → costs 

4. less → fewer

5. many → ∅

Each of the following sentence has one  mistake.Identify and correct the mistakes:1

.Tim is at=>BỎ the same age as Hoa.

2.At recess,the students practice to play=> playing basketball

3.Do you know how much a banana cost=>costs? 

4.There are less=>fewer TV programs for teenagers than there are for adults

.5.people are living longer ,so there are more and more many=>X old people.