Cho C = 2181 . 729 + 243 . 81.27

        D = 3² . 9² . 243 + 18 . 243 . 324 + 723 . 729

Tính C: D

Mn giúp e vs ạ

b) ( x + 1 ) + ( x + 2 ) + ( x + 3 ) +... + ( x+ 100 ) = 5 750

mn giúp em với ạ.Ai nhanh đc mụt tick và theo dõi ạ

1. I haven't played video games for 2 months.

-> _________________________________.

2. We started living here fifteen years ago.

-> _________________________________.

3. The last time she visited me was five months ago.

-> _______________________________________.

4. I haven't written to my best friend since July.

-> _________________________________.

5. Minh began to collect stamps in 2020.

-> ______________________________.

Exercise 2:
1. I started taking part in English club in April.
=> I ________________________________________________
2. My sister began teaching English 20 years ago.
=> The first time ____________________________________
3. It began to rain half an hour ago.
=> It ___________________________________________
4. They began to build this hotel a year ago.
=> They have_____________________________________
5. He has had his breakfast since 7 o’clock.
=> He ___________________________________________
6. Mr. Ba has talked to our teacher for an hour.
=> Mr. Ba began____________________________________
7. We started working here since August
=> The first time ____________________________________
8. I started writing this report a week ago.
=> I have __________________________________________

mn giúp e vs ạ

Mn giúp e vs ạ