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\(8xy^3-x\cdot\left(x-y\right)^3\)

\(=x\left[8y^3-\left(x-y\right)^3\right]\)

\(=x\cdot\left[\left(2y\right)^3-\left(x-y\right)^3\right]\)

\(=x\left(2y-x+y\right)\left[\left(2y\right)^2+2y\left(x-y\right)+\left(x-y\right)^2\right]\)

\(=x\left(-x+3y\right)\left(4y^2+2xy-2y^2+x^2-2xy+y^2\right)\)

\(=x\left(-x+3y\right)\left(5x^2-y^2\right)\)

a: Ta có: ED\(\perp\)HF

GK\(\perp\)HF

Do đó: ED//GK

Xét ΔEDH vuông tại D và ΔGKF vuông tại K có

EH=GF

\(\widehat{EHD}=\widehat{GFK}\)(hai góc so le trong, EH//FG)

Do đó: ΔEDH=ΔGKF

=>ED=GK

Xét tứ giác EDGK có

ED//GK

ED=GK

Do đó: EDGK là hình bình hành

b: Ta có: EDGK là hình bình hành

=>EG cắt DK tại trung điểm của mỗi đường

mà O là trung điểm của DK

nên O là trung điểm của EG

Xét tứ giác EMGN có

EM//GN

EN//GM

Do đó: EMGN là hình bình hành

=>EG cắt MN tại trung điểm của mỗi đường(1)

mà O là trung điểm của EG

nên O là trung điểm của MN

c: Ta có: EHGF là hình bình hành

=>EG cắt HF tại trung điểm của mỗi đường(2)

Từ (1),(2) suy ra EG,MN,HF đồng quy

15 tháng 10

D. Writing

Ex1

1 C => messaging (fancy + V-ing)

2 B => better

3 A => more slowly

Ex2

1 My sister is tired; therefore, she can't go to school today

2 Nam can run faster than Tuan

3 My mother detests commuting to work by train because it is always crowded

4 She is keen on doing DIY on the weekend

Ex3

1 Joe studies harder than other students in her class

2 Your father drives a car more carefully than you

(câu này thêm từ " more " vào đề cho hợp lí nha => so sánh hơn của trạng từ dài)

3 Nam is into getting up early in the morning

16 tháng 10

Phần D

I

1 C => messaging

2 B => better

3 A => more slowly

II

1 My sister is tired. Therefore, she can't go to school today

2 Nam cam run faster than Tuan

3 My mother detests commuting to work by train because it is always crowded

4 She is keen on doing DIY on the weekend

III

1 Jue studies harder than other students in her class

2 Your father drives a car more carefully than you

3 Nam is into getting up early in the morning

16 tháng 10
người da đen
16 tháng 10

Trong tiếng Anh, nigger (hay nigga) là từ dùng để chỉ nhóm người da đen. Từ này xuất hiện vào thế kỷ 18, bắt nguồn từ tiếng Tây Ban Nha negro (gốc Latinh: niger, nghĩa là màu đen). Nigger thường được sử dụng với ý nghĩa khinh miệt cho tới thế kỷ 20 tại Mỹ, nơi nó trở thành một từ lóng mang tính xúc phạm và phân biệt chủng tộc khi dùng để gọi những người da đen. Hiểu một cách thông tục, nigger có nghĩa là "mọi đen".

Bởi vì thuật ngữ này được coi là cực kỳ gây khó chịu, nó thường được gọi bằng từ "N-word", đặc biệt là trên Internet. Nhưng nó vẫn được sử dụng, đặc biệt là từ biến thể nigga, do chính những người Mỹ gốc Phi sử dụng. Trong các phương ngữ của tiếng Anh (bao gồm tiếng Anh chuẩn), "nigger" và "nigga" được phát âm giống nhau.

28 tháng 10

Hang enjoys making craft with her classmates at break time

IV. Read the passage and then choose the correct words in the box to fill in the blanks easily hobby cause limited computers Using the computer as your (1) ­­_______ can harm your health and social life. Firstly, sitting all day in front of the computer can (2) _______ health problems such as eye – tiredness and obesity. Secondly, you may get irritated (3) _______. Besides, if you use the computer sparingly, you will not...
Đọc tiếp

IV. Read the passage and then choose the correct words in the box to fill in the blanks

easily

hobby

cause

limited

computers

Using the computer as your (1) ­­_______ can harm your health and social life. Firstly, sitting all day in front of the computer can (2) _______ health problems such as eye – tiredness and obesity. Secondly, you may get irritated (3) _______. Besides, if you use the computer sparingly, you will not have time for your family and friends. In short, computers should only be used for a (4) _______ time.

V. Read the passage and then choose the correct words in the box

spinning tops

pick

jump rope

folk

 

I come from a small village in the country. In my village, teenagers like to (1) ……………. flowers and play (2) ………….games. In their free time, they often play (3) …………… and tug of war. They also love to play (4) ……….. with their wooden toys. After school, they often help herd buffalo for their parents.

 

VI. Read the passage and answer the questions.

I’m Hung. My grandmother told me that our village used to be very poor many years ago. The villagers had to work hard in the fields all day, but they could not earn enough for their living. Many people had to live in houses made of straw and mud. Nowadays, my village has changed a lot. People live in big brick houses. In the evening, they can listen to the news on the radio or watch TV for entertainment. All people in my village try their best to make their living better. They raise and resurface the roads so that the roads will not be muddy and flooded after it rains. They also share everything together in life. They have a peaceful life today.

1.      Did Hung’s village use to be very poor in the past?

_______________________________________________________

2.      What can they do in the evening?

_______________________________________________________

3.      What do they raise and resurface the roads for?

_______________________________________________________

4.         Do you like living in the country or in the city? Why?

_______________________________________________________

 

VII. Rewrite the following sentences without changing the meaning.

1. My sewing class finishes at 7 p.m. (until)

    …………………………………………………………………………………………..

2. It takes him 2 hours to practice karate. (spend)

→ ……………………………………………………………………………………………

2
28 tháng 10

IV. Read the passage and then choose the correct words in the box to fill in the blanks

easily

hobby

cause

limited

computers

Using the computer as your (1) ­­___hobby____ can harm your health and social life. Firstly, sitting all day in front of the computer can (2) ___cause____ health problems such as eye – tiredness and obesity. Secondly, you may get irritated (3) ___easily____. Besides, if you use the computer sparingly, you will not have time for your family and friends. In short, computers should only be used for a (4) ____limited___ time.

V. Read the passage and then choose the correct words in the box

spinning tops

pick

jump rope

folk

 

I come from a small village in the country. In my village, teenagers like to (1) ……pick………. flowers and play (2) ……folk…….games. In their free time, they often play (3) ………jump rope…… and tug of war. They also love to play (4) ……spinning tops….. with their wooden toys. After school, they often help herd buffalo for their parents.

28 tháng 10

VI. Read the passage and answer the questions.

I’m Hung. My grandmother told me that our village used to be very poor many years ago. The villagers had to work hard in the fields all day, but they could not earn enough for their living. Many people had to live in houses made of straw and mud. Nowadays, my village has changed a lot. People live in big brick houses. In the evening, they can listen to the news on the radio or watch TV for entertainment. All people in my village try their best to make their living better. They raise and resurface the roads so that the roads will not be muddy and flooded after it rains. They also share everything together in life. They have a peaceful life today.

1.      Did Hung’s village use to be very poor in the past?

→______Yes, it did_________________________________________________

2.      What can they do in the evening?

→________They can listen to the news on the radio or watch TV for entertainment______________________________________________

3.      What do they raise and resurface the roads for?

→_______They raise and resurface the roads so that the roads will not be muddy and flooded after it rains________________________________________________

4.         Do you like living in the country or in the city? Why?

→________I like living in the country because the life here is very peaceful_______________________________________________

 

VII. Rewrite the following sentences without changing the meaning.

1. My sewing class finishes at 7 p.m. (until)

  →  ………My sewing class doesn't finish until 7 p.m…………………………………………………………………………………..

2. It takes him 2 hours to practice karate. (spend)

→ ………He spends 2 hours practicing karate……………………………………………………………………………………