Hello everyone, today i will tell you about my new teacher in the extra english class. Her name is Tuyết. She is tall. She has short blonde hair, black eyes. Although I learned about her two times but I have a good impression on her. She lives in Van Khe so the distance is quite long but she is always on time. She teaches very enthusiastic and easy to understand. She is very friendly with students, sometimes she also shares very useful stories. She is a good teacher.

Nếu y = 0 => |x| = 0 => x = 0 (Không xảy ra)

Nếu z = 0 => |x| = y³ > 0 => y dương mà z = 0 nên x là số âm

Nếu x = 0 => y³ = y²z => y³ : y² = z => y = z => y; z cùng dấu (không xảy ra)

Vậy z = 0; x là số âm; y là số dương

1..............................................what is her name................?

-her name is Lan.

2......................what is her family name................................................?

-her family name is Nguyen.

3....................what is her middle name...................................................?

- her middle name is Ngoc.

4.........................how old is she.................................................?

-she is thirteen years old.

5..................which class she you in......................................................?

she is in grade 7.

6.....................where dose she live.........................................................?

- she lives on Nguyen Trung Truc Street.

7.......how far is it from her house to school...............

- It is about two kilometers from her house to school.

8....................why is she happy today.................

- she is happy today because she has mayny new friends.

x/3 = y/4 ; y/3 = z/5 và 2x - 3y + z = 6

=> x/9=y/12 ; y/12=z/20

=> x/9=y/12=z/20 và 2x-3y+z=6

áp dụng tính chất dãy tỉ số bằng nhau, ta có:

2x/18 = 3y/36 = z/20 = 2x-3y+z/ 18-36+20 = 6/2 = 3

Vậy: x=27

y=36

z=60

a) Nửa chu vi của mảnh vườn HCN đó là:

140:2=70 (m)

Diện tích mảnh vườn hình chữ nhật đó là:

(70.2/3)*(70.1/3)=9800/9 (m2)

b) diện tích đất trồng rau là:

9800/9*1/3=9800/27 (m2)

diện tích đất trồng hoa là:

(9800/9-9800/27)*1/6=9800/81 (m2)

1. Ba's new house is ....bigger................................. than his old house. (big)

2. Summer is ........hotter............................... than spring. (hot)

3. Today Lan is ..........unhappy........................ Because she misses her parents. (happy)

4. They are ..........talking.......................... to their teacher in the school yard. (talk)

5. Our school is big. There are fifty-six ............classrooms................ in our school. (class)

6. mai is our new ........classmate................................ . (class)

7. Miss Hong is our new English ......teacher................ . (teach)

8. My brother is 9stay) ....staying.................. with our grandparents at the moment. (stay)

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