Giả sử bạn có n=100, bây giờ bạn muốn tính tổng 1+2+...+100 thì bạn dùng công thức sau:

=(1+n)*n/2 = (1+100)*100/2 = 5050

TP.

Sin loi

Answer:

I. Write the correct word under each picture.

1. guitar

2. portrait

3. violin

4. painting

5. puppet

6. drum

7. saxophone

8.c ello

II. Complete the sentences with the words in the box.

1. poet

2. singer

3. composer

4. comedian

5. pianist

6. artist

7. musician

8. actress

III. Complete the sentences with the correct tense of form of the verbs in the box.

1. draw

2. paint

3. sing

Answer:

Từ câu số 6 đến câu số 10 không làm bởi vì không biết đề yêu cầu gì.

VII. Complete the sentence with as, than or from

1 as

2 than

3. as

4. from

5. as

6. than

7. from

8. as

VIII. Complete the second sentence using the word in brackets.

1. Walking is not as fast as cycling

2. This tea's taste is different from the one I usually drink

3. Health is more important than Money

4. His new guitar is different from pencil painting

5. Today's exam was shorter than yesterday

6. Your idea is not the same as mine

Answer:

IX. Complete the sentences with too or either

1. either

2. too

3. either

4. either

5. too

6. either

7. too

8. too

X. Fill in each blank with a suitable preposition.

1. for

2. at

3. of

4. on

5. in

6. of

7. at

8. at

Đổi 1 gio chieu = 13 gio

Thoi gian di tu nha den thi tran roi quay ve nha la   13 gio - 8 gio - 1 gio 30 p = 3 gio 30 p

3 gio 30 p =3,5 gio

Thoi gian di thu nha ra thi tran   3,5 : 2 = 1,75 gio

Quang duong tu nha ra thi tran la   1,75x12 = 21 km

đ/s : 21 km

thời gian ông ấy đi từ nhà tới thị trấn: (13 giờ chiều - 8 giờ sáng - 1 giờ 30 phút)/2 = 1 giờ 45 phút

45 phút = 3/4 giờ

quãng đường từ nhà ông ấy đến thị trấn là

(12*1)+(12*3/4)=21(km)

Đáp số: 21 km

bài đấy dễ :v