Lời giải:
Thể tích thùng chữ nhật:

$5\times 3\times 4=60$ (dm³)

Thể tích 1 hình hộp con là: $1\times 1\times 1=1$ (dm³)

Người ta xếp được nhiều nhất số hộp con là:

$60:1=60$ (hộp)

a)Số tự nhiên đó là:\(124\)
b)\(0,8< x< 2,03\)
Mà x là số tự nhiên nên chỉ có 2 giá trị x thỏa mãn là:\(1\) và \(2\)
c)Số đó là:
\(\dfrac{240}{60\%}=240\times\dfrac{5}{3}=400\left(tạ\right)\)
d)\(2,15\times y< 10,5\)
\(y< 10,5:2,15\)
\(y< 4,8837...\)
Mà y là số tự nhiên lớn nhất
Nên \(y=4\)

a. x = 124 

b. x = 1 hoặc x =2 

c. 240 : 60% = 400 

d. y = 4

Chiều cao là : \(36\times40\%=36\times\dfrac{2}{5}=14,4\left(m\right)\)

Diện tích Tam giác là : \(S=\dfrac{1}{2}\times36\times14,4=259,2\left(m^2\right)\)

Đổi \(10990m=1099000\left(cm\right)\)

Chu vi bánh xe là : \(17,5\times2\times3,14=109,9\left(cm\right)\)

Bánh xe phải quay : \(1099000:109,9=10000\left(vòng\right)\)

Nếu số vở lớp 5B bớt đi 14 quyển thì 2/5 số vở lớp 5A bằng số vở lớp 5B lúc sau

Khi đó tổng số vở của hai lớp lúc sau là: 140 - 14 = 126 (quyển)

Phân số chỉ 126 quyển vở : 

1 + \(\dfrac{2}{5}\) = \(\dfrac{7}{5}\) ( số vở lớp 5A)

Số vở lớp 5A là:  126 : \(\dfrac{7}{5}\) = 90 (quyển)

Số vở lớp 5B là : 140 - 90 = 50 (quyển)

Đs..

Bán kính hình tròn đó là: \(\sqrt{28,26\div3,14}=3\) dm 

Chu vi hình tròn là: 3 x 2 x 3,14 = 18,84 dm 

Bán kính đường tròn là : \(S=R^2\times3,14\\ =>28,26=R^2\times3,14\\ =>R^2=9\\ =>R=3\left(dm\right)\)

Chu vi là : \(C=2R\times3,14=2\times3\times3,14=18,84\left(dm\right)\)

1 Would you like some orange juice?

2 He can speak English and Vietnamese

3 There are many students in my school

4 What subjects do you have today?

5 She does her homework in the evening

6 My sister is a teacher, too

7 They are my favourite drink and food

8 I was born on July 2nd, 1996

9 Mary is writing a letter

10 What did you do at the festival?

1 Would you like some orange juice?

2 He can speak English and Vietnamese

3 There are many students in my school

4 What subjects do you have today?

5 She does her homework in the evening

6 My sister is a teacher, too

7 They are my favourite drink and food

8 I was born on July 2nd, 1996

9 Mary is writing a letter

10 What did you do at the festival?

Đây nhé bạn !

33 Mr and Mrs Jackson are Mrs Hoa's friends

34 Where do you usually go when you have free time?

35 Which place is Phuong going to visit first?

36 Are you and your father going to do anything tonight?

 Mr and Mrs Jackson are Mrs Hoa's friends

 Where do you usually go when you have free time?

Which place is Phuong going to visit first?

Are you and your father going to do anything tonight ?

Chúc bạn học ngoại ngữ giỏi nhé 

23 Children in Vietnam usually go to school at the age of six

24 David borrowed some money from his sister and never paid her back

25 He always comes to school late because of getting up late

26 Where do you usually have breakfast?

27 How much rich do you often have for each meal?

28 What do you usually do after school day?

29 What are you going to do tomorrow morning?

30 You should go to bed and keep warm

31 We're having a good time here in Scotland

32 They are really nice and friendly

23 Children in Vietnam usually go to school at the age of six

24 David borrowed some money from his sister and never paid her back

25 He always comes to school late because of getting up late

26 Where do you usually have breakfast?

27 How much rich do you often have for each meal?

28 What do you usually do after school day?

29 What are you going to do tomorrow morning?

30 You should go to bed and keep warm

31 We're having a good time here in Scotland

32 They are really nice and friendly 

Câu trả lời đúng nè ,tick cho mình nhé

12, have/ eggs/ meat./ some/ any/ I/ but/ have/ don't/ I

I have some eggs but I don't have any meat

13, face./ eyes/ big/ Lan/ round/ black/ a/ and/ has

Lan has a round face and big black eyes

14, bread/ father/ How/ your/ much/ does/ want/ ?

How much bread does your father want?

15, there/ in our house?/ How many/ cans of food/ are

How many cans of food are there in your house?

16, small/ thin/ sister/ white/ and/ Her/ lips/ teeth./ has

Her sister has thin lips and small white teeth.

17, Young's/ round/ Mrs/ Is/ oval?/ face/ or

Is Mrs Young's face round or oval?

18, hair./ a round face/ blue eyes/ has/ short black/ Mr Pike/ and

Mr Pike has a round face, blue eyes and short black hair

19, out/ The/ fall./ Watch/ box/ going to/ is

Watch out! The box is going to fall

20, Look/ clouds./ at/ black/ the

Look at the black clouds!

21, I/ and a/ an/ had/ banana/ lunch./ egg/ for 

I had an egg and a banana for lunch

22, the lights,/ turn off/ please!/ Can you

Can you turn off the lights, please!