Số số hạng là:

     \(\left(30-20\right):1+1=11\)(số hạng)

\(\Rightarrow\) Tổng: \(\left(30+20\right)\cdot11:2=275\)       

1. Didn't they ( not come ) come school yesterday?

2.The windows ( not close) didn't close yesterday 

@Katty Wide awake của Katy Perry đúng không??

589 * x - 148 = 189

589 * x         = 189 + 148

589 * x         =  337

           x       =  337 : 589  = 337 / 589

1. Tom runs very fast → Tom is a fast runner

2. Vietnam has a lot of beautiful places.→ There are a lot of beautiful places

3. He started driving 1 month ago → He has driven for 1 month

4. My favourite programme on TV is cartoons → I like cartoon programmer on TV best.

5. Mai plays football very well → Mai is very good football player.

6. If we don't leave now, we will miss the train → Unless we leave now, we won't miss the train.

7. No one in my class is taller than Tonny → Tonny is the tallest in my class.

8. Going out is more interesting than staying at home → Staying at home is more boring than going out.

Look! The plane (fly) is flying towards the airport. It (land)is landing

1. Have you ........... seen a rainbow? (A. never / B. ever / C. before / D. yet)

2. The programme is boring ......... we can't watch it. (A. so / B. but / C. and / D. because)

3. My class has won the aerobics contest.-"........." (A. Really / B. Thank you / C. Congratulations / D. Well)

4. Many girls and women ............. aerobics to keep fit. (A. play / B. do / C. go / D. doing)

mk ở bắc ninh

1 . My father (  go ) goes to school by bus every mornning

2 . Listen ! They ( play ) are playing the piano

 3 . He ( do ) does the homework every evening

4 . She ( not listen ) doesn't listen to the music in her free time 

5 . Thuy ( not travel ) doesn't travel to Ha Noi every month