Lien spends too much money ... clothes and shoes.

A. for B. on C. in D. with

15 hình                       

4 số đó có dạng: a + a + 1 + a + 2 + a + 3 = a x 4 + 6 

a x 4 chia hết cho 4 ; 6 không chia hết cho 4

Nên tổng của 4 số tự nhiên liên tiếp không chia hết cho 4

3/Put the verbs in brackets in the correct form.

1.The Olympic Games (be)..are.... held once every four years.

2.The first Olympic Games (take)......took...... place in Greece in 776 BC.

3.People (start).....started...... to use computers about 50 years ago.

4.-What's that noise?

-The children (play)...are playing.... tug of war.

5.-What .....did..... you(do).....do..... last weekend?

-I (cycle)....cycled..... round the lake with my friends.

Then I (watch)...watched.... TV in the afternoon.

lúc đầu ý bn là 5/1.3 đúng k, mk chỉnh lại như thế cho tiện nhé

a) \(\frac{5}{1\times3}+\frac{5}{3\times5}+\frac{5}{5\times7}+...+\frac{5}{99\times101}\)

\(=\frac{5}{2}\left(\frac{1}{1}-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{99}-\frac{1}{101}\right)\)

\(=\frac{5}{2}\left(1-\frac{1}{101}\right)\)

\(=\frac{5}{2}\times\frac{100}{101}=\frac{250}{101}\)

b) \(\frac{3^2}{8\times11}+\frac{3^2}{11\times14}+\frac{3^2}{14\times17}+...+\frac{3^2}{197\times200}\)

\(=\frac{9}{8\times11}+\frac{9}{11\times14}+\frac{9}{14\times17}+...+\frac{9}{197\times200}\)

\(=3\left(\frac{1}{8}-\frac{1}{11}+\frac{1}{11}-\frac{1}{14}+\frac{1}{14}-\frac{1}{17}+...+\frac{1}{197}-\frac{1}{200}\right)\)

\(=3\left(\frac{1}{8}-\frac{1}{200}\right)\)

\(=3\times\frac{3}{25}=\frac{9}{25}\)

Cho dang dug

1 I ' m really interested in this book . It ' s full of __useful__ information . ( use )

2 The local people were very __friendly__ towards us . ( friend )

3 It ' s important to exercise ___regularly__ . ( regular )

4 Is there a good restaurant is the ___neighborhood____ ? ( neighbor )

5 The ___energetic__ students often play game at recess . ( energy )

1. I'll do the shopping when I've finished (clean).........cleaning.........the house

2. Are you going to give up (smoke).........smoking..........?

3. He (leave).......left.........London 2 years ago and I (not see)..........haven't seen..........him since then.

4. By the time she got back, he (go)...........had gone............

5.My brother (give).............has given............tickets to the concert already.

6. My father used to (smoke)..........smoke.........a lot

7. If it is a nice day tomorrow, we (go).............will go.............swimming.

8. I'm still looking for a job, but I hope (find).........to find........something soon.

9. The lazy can never (succeed)...........succeed...........

10.Although the weather was bad, they all (enjoy).........enjoyed........the field trip last week.

không có tháng nào có 27 ngày

Bạn vào mục câu hỏi hay kéo xuống và thấy có 1 bài tương tự nhé

1. he / be scared?// hate the sound of the drill

............................................- Why is he scared? - Because he hates the sound of the drill.............................................

2. children / often have toothache?// eat lots of candy

..............................- Why do chidren often have toothaches? - Because they eat lots of candies..................................

3. you / be late for class yesterday?// miss the first bus

..................................- Why were you late for class yesterday? - Because I missed the first bus...................................

4. her tooth / hurt ?// have a cavity

.........................................- Why does her tooth hurt? - Because she has a cavity.............................................

5. they / not come to the metting last night?// be besy

...............................- Why didn't they come to the meeting last night? - Because they were busy................................

6. she / go to the doctor?// have a headache

......................................- Why does she go to the doctor? - Because she has a headache.........................................

7. Minh/ not say anything/ yesterday ?// be very nervous

................................- Why didn't Minh say anything yesterday? - Because he was very nervous.................................

8. we / brush our teeth after meals?// want to have healthy teeth

.........................- Why do we brush our teeth after meals? - Because we want to have healthy teeth...........................