Từ 1 - 9 có 9 số 9 chữ sô

Từ 10 - 99 có 90 số 180 chữ sô

Có số chữ số của trang có 3 chữ số là: 1248 - 180 - 9 = 1059 chữ số

Có số trang có 3 chữ số là: 1059 : 3 = 353 trang '

Quyển sách đó có tất cả số trang là: 9 + 90 + 353 = 452 trang

     Đáp số : 452 trang 

#Hoctotnha-3

cờ vua luôn cần sự kiên trì mà ra

*S + find + N / V-ing + adj

*S + think + N / V-ing + is + adj

#Hoctotnha

x  - \(\dfrac{2}{5}\)x = \(\dfrac{-3}{25}\)

x ( \(1-\dfrac{2}{5}\)) = \(\dfrac{-3}{25}\)

x . \(\dfrac{3}{5}=\dfrac{-3}{25}\)

      x  = \(\dfrac{-3}{25}:\dfrac{3}{5}\)

      x  = \(-\dfrac{1}{5}\)

Vậy x = \(-\dfrac{1}{5}\)

rewrite the following sentences in reported speech with gerund

9.'' I'm sorry that I broke the glass'' said peter

=>Peter apologized for having broken the glass

10.'' let's invite mr.brown to the party next weekend'' he said

=> He suggested inviting Mr. Brown to the party the following week

11.''you stole the jewels'' the inspector said to him

=>The inspector accused him of having stolen the jewels

12.'' I'm sorry I didn't remember to submit the report, the boss'' said bob

=>Bob apologized to the boss for didn't remember to submit the report

13.'' It's nice of you to invite me to lunch'' bob said to john

=>Bob thanked John for inviting him to lunch

14.carol said ''what about going to the cinema this weekend?''

=>Carol suggested that they should go to the cinema that weekend

15.'' I'm sorry I forgot your birthday '' Dave said to julia

=>Dave apologized to Julia for having forgotten her birthday

16.'' why didn't you tell me the truth last night?'' he said to me

=>He accused me of not having told him the truth last night

#Hoctotnha

Giải thích: thì hiện tại hoàn thành tiếp diễn chỉ hành động lặp đi lặp lại trong 1 khoảng thời gian

*Đáp án: have been reading

*Dịch: Helen đã đọc cuốn sách đó trong 3 ngày liên tiếp.

Cấu trúc: 

<+> S + have/ has + been + V-ing

<-> S + haven’t/ hasn’t + been + V-ing

<?> Have/ Has + S + been + V-ing ?

Advs: Since + mốc thời gian

          For + khoảng thời gian

          All + thời gian

#Hoctotnha

Put paid to sth nghĩa là trả tiền cho 1 cái gì đó

#Hoctotnha

* Khí lưu thông là lượng khí vào hoặc ra khi chúng ta hô hấp bình thường.

* Khí bổ sung là Lượng khí được bổ sung khi hít vào gắng sức

* Khí dự trữ là Lượng khí được đẩy ra khi gắng sức thở ra

* Khí cặn là Lượng khi còn trong phổi sau khi đã thở ra gắng sức

I. Điền dạng đúng của động từ trong ngoặc:

1. I … am reading….. (read) an interesting book in the library now.

2. At the moment, my mom ……is preparing……. (prepare) breakfast for my family. I and my brother …are brushing…………… (brush) our teeth and ……washing…………….. (wash) our face. My father ……is having………. (have) a cup of coffee and ……listening……… (listen) to the radio.

3. Today ……is…. (be) Sunday. Mai and her mother ……are going……… (go) to the supermarket now. Her brother and her dad …are going fishing……….. (go/fish).

4. Look! Mary and Tom …are dancing……….. (dance) in the studio.

5. I ……am taking…… (take) a photograph of my mom and my dad on Mount Fuji now.

6. My family …is going…… (go) to Hoan Kiem Lake and …watching……. (watch) fireworks now because today …is… (be) Tet Holiday.

7. Be careful! The bus …is coming…….. (come)

8. At present, my mother ……is going shopping ... (go/shop) and …preparing…. (prepare) food for Tet Holiday. My father …is buying……. (buy) cherry blossoms at the flower market and I …am decorating……. (decorate) my house. It …is… (be) fun.

9. Look out! Your 3-year-old son …is riding………… (ride) a bike.

10. It’s 9 pm now and my dad …is working………. (work). My sister and I …are doing…. (do) our homework. My mother …is watching………… (watch) movies.

II. Điền dạng đúng của từ trong ngoặc:

1. Today …is…… (be) December 14^th. Today …is…….. (be) my birthday. At the moment, I …am cleaning……… (clean) the house. My mother …is preparing………. (prepare) a delicious meal and my sister ……is baking……… (bake) a cake for me.

2. Mary …loves……. (love) Christmas. Now she …is decorating….. (decorate) the Christmas tree and …singing…. (sing) Christmas songs. Her little brother …is writing…… (write) his Christmas wish and ……putting…… (put) it in the socks.

3. My father …is flying…… (fly) to America now. He …takes… (take) me to school every day but now I ……am going……….. (go) to school by bus.

4. I …am.. (be) sick. My mother ……is going…………. (go) to the pharmacy and …buying….. (buy) me medicine now.

5. I …loves.. (love) the blue shirt but now I …am wearing…. (wear) the red one.

6. It …is.. (be) summer now. Every year, my family …goes…… (go) back to our hometown and ……visits… (visit) our grandparents. But at the moment, we ……are going….. (go) on a summer vacation in Da Nang.

7. Today …is… (be) Teacher’s Day. Now I …am visitting…….. (visit) my old teachers and my classmates ……giving……… (give) them flowers.

8. My children …loves….. (love) Art. At the moment, my son ……is painting……… (paint) and my daughter …is singing……. (sing)

9. At present, Nam ……is playing……….. (play) football with his friends at the park.

10. Now, I and my brother …are studying……. (study) at Trung Vuong Primary School. We ……walk... (walk) to school every day.

#Hoctotnha

 Bò sát được hình thành cách đây khoảng 280 - 320 triệu năm