Phát biểu nào sau đây không đúng?

A. CrO 3 là oxit axit

B. Cr 2 O 3 và Cr OH 3  đều là chất lưỡng tính

C. Kim loại crom tan được trong dung dịch NaOH đặc

D. Dung dịch K 2 CrO 4  có màu vàng.

Tìm số nguyên x thỏa mãn:

a ) x 8 = 1 4 ; b ) x 15 = 4 10 ; c ) 3x 32 = − 3 8 ;

5. Write superlative from of the adjectives in parenthese:

1. Who is the (tall)............tallest..................person in your family?

2. My mum is the (good)...............best....................cook in the world.

3. December is the (cold)................coldest........................month of the year in my country.

4. What's the (dangerous)...........more dangerous...........................animal in the world?

5. Ethan is the (happy)...........happiest...........................boy that I know.

6. Where are the (nice)......................nicest....................beaches in your country?

7. She bought the (big)....................biggest...........................cake in the shop?

8. Who is the (famous)....................more famous...........................singer in your country?

9. Sam is the (rich).......................richest.......................man in this city.

10. The text book is the (boring)...............more boring.............................book.

thanh kiều 

1) Lan ( not be )isn't in the room at the moment . She work in the garden

2) the lights are red . You can't ( go )go now

3) I always ( study ) study English for 2 hours everyday

4) Look ! The teacher ( look ) is looking at you

5) I can't sleep because my brother ( play ) is playing the guitar so load

6) Don't make noise . The baby ( sleep ) is sleeping in the next room

7) Lan ( play ) is playing the piano at present . You can ( call )call her later

8) Be quiet ! Someone ( sing )is singing in the room

9) The library ( open )opens at 7 a.m and ( close ) closes at 4 p.m . Miss Huong ( be ) is our librarian . She ( be )is in the library at this time . Some students ( borrow )are borrowingbooks . Others ( sit ) are sitting at the tables and ( read ) reading books . She ( help )is helping students to find the books they want . The librarian ( work ) is working hard now.

1. viết lại câu nghĩa không thay đổi

1. the car is very expensive

-what an expensive car!

2. my classer stant at six thirty

- my classer start at half past six.

3. my classer start at seven fifteen

- my classer start at a quarter past seven

4. do you want to buy save cakes?

- would like to buy save cake?

5. are there forty students in your class

- does your class have forty students?

gặp sôcôla

tuổi con là 6 tuổi nha 

Diện tích xung quanh ( 4 bức tường) là:

(4,5+3,7)x2x2,6=42,64( m²)

Diện tích cần quét vôi là:

42,64+4,5x3,7-5,8=53,49 m²

T..i..c..k nha