tổng:(1997+1)x1997:2=1995003
 

lấy chiều cao nhân cạnh đáy chia 2 !! 

số 0 thuộc 1 loại số khác,không phải âm cũng ko phải dương

Exer 1: Make questions for the underlied words ( Đặt câu cho những từ in đậm dưới đây ):

1. These students play soccer once a week.

\(\Rightarrow\) How often do these students play soccer?

2. Ba usually plays the guitar after school.

\(\Rightarrow\) What does Ba usually do after school?

3. We study different countries and their people in Geography class.

\(\Rightarrow\) What do you do in Geography class?

4. Yes. My favorite subject at school is English.

\(\Rightarrow\) Is your favorite subject at school English?

5. Nam wants to go to the movies because there is a good film on.

\(\Rightarrow\) Why does Nam want to go to the movies?

Exer 2: Rewrite the sentences ( Viết lại câu ):

1. Let's go to the movies.

=> How about going to the movies?

2. She likes to read books.

=> She enjoys reading books.

3. Why don't we do our homework?

=> What about doing our homework?

4. How about having a drink?

=> Let's have a drink.

5. I enjoys going to the party.

=> I like to go to the party.

de lam em an nhanh la duoc roi

Nội dung và nghệ thuật bài thơ “Phò giá về kinh”.

Ta có: Diện tích hình tam giác = \(\frac{\text{Đáy }\times\text{chiều cao}}{2}\)

=> \(25,3=\frac{\text{Đáy }\times5,5}{2}\)

=> 25,3 x 2 = Đáy x 5,5

=> 50,6 = Đáy x 5,5

=> Đáy = 50,6 : 5,5 = 9,2

Vậy độ dài đáy là 9,2 cm.

Vì 12ab chia cho 2 và 5 dư 1 nên => b = 1.Ta được số mới:12a1

Vì 12ab chia hết cho 9 nên tổng các chữ số phải chia hết cho 9: {1+2+a+1} = 4 + a

Vậy , ta suy ra: a phải = 5 (vì 4 + 5 = 9)

Đ/s:.........

Complete the second sentence so that it has the same meaning as the first one :

1. Why don't we go to the beach ?

What about going to the beach?

2. Nam will visit his parents tonight ?

Câu 2 không có từ đầu câu hả bn

Chuyển sang bị động

6, Tolstoy wrote '' war and peace ''.

\(\Rightarrow\) " War and Peace" was written by Tolstory.

7, Heming way didn't write '' hamlet ''.

\(\Rightarrow\) " Hamlet" wasn't written by Heming way.

8. Some one built that house in 1930.

\(\Rightarrow\) That house was built in 1930.

9. Bod Smith built that house.

\(\Rightarrow\) That house was built by Bod Smith.

10. They opened the factory at 9 o'clock.

\(\Rightarrow\) The factory was opened at 9 o'clock.