Số hạng thứ 20 của dãy là: 39x41=1599

- Số hạng thứ 21 của dãy là: 41x43=1763

nhớ like cho mình nha

don't have

ban dang tung bai mot thoi nha

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)

1, there is a picture in the living room.
=> thieu 'a'

2,he family is in Hong Kong.
=> he => his

3, he name Lan.
=> he => his

4,there are four people in my family.
=> câu này đúng rồi mà

5, there are two ruler on my table.
=> ruler => rulers

6,my father is fivety years old.
=> fivety => fifty

7,there are five rooms in your house?
there are => are there

8,there is a pen on the table?
there is => is there

9,my father is fifty-six year old.
=> year => years

10 , my son is one years old.
=> years => year

dễ thế mà không làm được

She is old enough to work by herself