bạn cảm ơn ai vay có bn ấy có giup bn làm đau

mk chua hok den nen ko co bit lam

cảm ơn b nhé

6. a. Ready-made clothes aren't as expensive as tailor-made clothes.
    b. Tailor-made clothes are more expensive than ready-made clothes.
7. a. The hill is lower than my expectations. 
    b. The hill isn't as high as I thought. 
8. a. My aunt isn't as old as you think she is. 
    b. My aunt is younger than you think.
9. a. The river wasn't as shallow as he expected.
    b. The river was deeper than he expected.
10. a. The sea wasn't as smooth as I had hoped. 
      b. The sea was more turbulent than I had hoped.

b1:

x-y=5->x=y+5

->x-3y/5-2y=y+5-3y/5-2y=5-2y5-2y=1

->đpcm

Rock music is not as popular as pop music all over the world.
This year's music contest is not like last year's.

artist ; heat

Để tăng diện tích tiếp xúc giữa than (C) và oxi

vì sao than tổ ong người ta lại làm các lỗ nhỏ ở giữa?

=>Tăng diện tích của than tiếp xúc vs oxi khiến tăng hiệu suất

C+O2-to>CO2

theo mik chắc để lấy mật hau cho các con nhộng vào kén

1 A

2 A

3 A

4 B

5 D

6 B

7 C

8 A

9 A

10 C

1. Their writting was handed in by all students on time

2. A lot of cakes were made for their mother's birthday last week

3.  That is done silly by him

\(A=\dfrac{1}{1.2}+\dfrac{1}{2.3}+...+\dfrac{1}{49.50}\)

\(=\dfrac{1}{1}-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{49}-\dfrac{1}{50}\)

\(=1-\dfrac{1}{50}\)

\(=\dfrac{49}{50}\)

\(A=1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{49}-\dfrac{1}{50}\)

\(=1-\dfrac{1}{50}=\dfrac{49}{50}\)