1. Mr.Quang __doesn't listen___to music (not listen)
2.Now they (watch)__are watching_____TV
3.I (play) ___am playing____tennis with my father at the present
4.Look ! The children (do) __are doing__aerobics
5.Be careful ! The bus (come) ___is coming____
6.My parents (have) _are having___in the restaurant at the moment
7.Where is her sister ? She (read) is reading books in the room
8.We (not listen) ___aren't listening_____to music now
9.What___are_______they (do) __doing______at the moment
10.Listen ! My younger brother (sing) is singing an english song
11.My father and I (grow) _are growing __ vegetables in the garden now

1.Next year , I (be) ___will be____a teacher
2.We (visit)____will visit ____Huong pagoda next week
3.His friends (read)___will read_____this book tomorrow
4.My mother (not take)___won't  take___some photos the next trip
5.I (not be) ___won't be____a teacher next year

1. B.lasts

2. C.less

3. C.in

4. C.care 

5. A.I do,too

6. B.less

7. D.nervous 

8. C.teacher

1. This box has more chalks than that one

2. This car is more expensive than that car

3. She is the most beautiful of three sister

1.She (be) will be 14 years old on her next birthday
2.We (come) will come there tonight
3.I (not go) won't go  to HN next week
4.What will they (do) do tomorrow ?
5.My father (play) will play soccer with his friends next sunday

1, have

2, were 

Cho \(A=\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+...+\frac{1}{6561}\)

    \(\frac{1}{3}A=\frac{1}{3}\times\left(\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+...+\frac{1}{6561}\right)\)

    \(\frac{1}{3}A=\frac{1}{9}+\frac{1}{27}+\frac{1}{81}+...+\frac{1}{19683}\)

 \(A-\frac{1}{3}A=\left(\frac{1}{3}+\frac{1}{9}+...+\frac{1}{6561}\right)-\left(\frac{1}{9}+\frac{1}{27}+...+\frac{1}{19683}\right)\)

\(\frac{2}{3}A=\frac{1}{3}-\frac{1}{19683}\)

\(A=\frac{4840}{9683}:\frac{2}{3}=\frac{7260}{9683}\)

Gì zạ?

Cho hình lăng trụ đứng tam giác ABC.A'B'C' có đáy ABC là tam giác vuông tại A sao cho BC = AC' = 5a và AC = 4a. Tính thể tích hình lăng trụ.

A. V =   9 a 3

B.  V =   36 a 3

C.  V =   18 a 3

D. Kết quả khác