My school isn't too big but it looks beautiful. It'll have about 24 classrooms, 5 rooms for the teachers,....The yard'll surrounded by many kinds of trees. My school'll have many teachers and students. It'll have a sport yard to play other sports like badminton, volleyball, soccer,... or a swimming pool. And it'll have all of the things for teaching and learning.

Bài giải

r x r  của hình tròn là:

490,625 : 3,14 = 156,25 ( cm²)

Giải bằng phương pháp lựa chọn  ta có : 12,5 x 12,5 =  156,25 ( cm²) Vậy bán kính của hình tròn là 12,5 cm

( Chú ý : cách giải này đã làm quen với học sinh tiểu học không khai căn bậc 2 của toán THCS mà lập luận như trên)

Chu vi hình tròn là :

12,5 x 2 x 3,14 = 78,5 cm

Đáp số : 78,5 cm 

I. Put the verbs in brackets into the simple present or the present continuous tense.

1. Do you ( belong) belong to your local library ?

Yes, i do

Do you ( read ) read a lot?

Yes, quite a lot

How often do you ( change ) change your books ?

I ( change ) change one every day

2. Mary usually ( learn) learns languages very quickly but she ( not seem ) won't seem able to learn modern greek.

3. I always ( buy ) buy lottery tickets but i never ( win ) win anything.

II.Put the verbs in brackets into the ssimple past or the past continuous tense.

1.You looked very busy when i ( see ) was seeing you last night.What were you ( do ) doing ?

2. The boys ( play) played cards when they ( hear ) were hearing their father's step. They immediatrly ( hide ) hode the cards and ( take ) took out their lesson books

3. He ( clean ) cleaned his gun when it accidentally ( go ) was going off and ( kill ) killed him.