\(b,=\dfrac{5}{11}\\ c,\dfrac{2}{3}\)

b) = 5/11

c) = 2/3

a,\(\dfrac{8.7.5}{11.8.7}=\dfrac{5}{11}\)

b,\(\dfrac{19.2.5}{19.3.5}=\dfrac{2}{3}\)

Vậy đáp án đúng là:

   Trong giờ khoa học, cô giáo hỏi Tí:

- Tí, em hãy cho cô biết mùa lạnh ta phải làm gì ?

   Tí đang ngủ, giật mình đứng dậy:

-Thưa cô, mùa lạnh ta phải nổi da gà ạ !

Bài 1:

1B

2D

3E

4C

5A

6G

7F

2) 

a) (3x+y)(9x²-3xy+y²)=27x³+y³

b) (2x-5)(4x²+10x+25)

c)(2a+3b)(4a²-6ab+9b²)

d)(5x-4y)(25x²+20xy+16y²)=125x³-64y³

3)

b a b a b

A

C

B

1 C

2 A

3 B

4 C

5 A

6 B

7 A

8 C

9 C

10 A

11 C

12 A

13 B

14 C

15 A

Bài 2

1 When

2 in case

3 since

4 although

5 before

6 as long as

7 as though

8 because

9 while

10 As long as

33 Now I don't go climbing as much as I used to when was younger

34 There used to be dreadful fogs in England

35 We haven't decorate the room for years

36 The other guests will start dinner before we arrive 

37 I wish the school holidays were longer

38 He is too young to join the club

39 It's very necessary to blame him for his mistakes

40 It was obligatory for him to pass his itermediate level English examination

33. Now I don't go climbing as much as I used to when I was younger

34. There used to be dreadful fogs in England.

35. We haven't decorated the room for years.

36. The other guests will start dinner before we arrive. 

37. I wish the school holidays were longer.

38. He is too young to join the club.

39. It's very necessary to blame him for his mistakes.

40. It was obligatory for him to pass his itermediate level English examination.

mình nhắn nhầm.Mi thành mai nhé

ngu

tao cắt cu bây giờ