a: Xét tứ giác ADHE có 

\(\widehat{ADH}=\widehat{AEH}=\widehat{DAE}=90^0\)

Do đó: ADHE là hình chữ nhật

\(a^3+3a^2b+3ab^2+b^3-2022=\left(a+b\right)^3-2022=\left(2021-2020\right)^3-2022=1-2022=-2021\)

18 D

23 C

24 B

1. A

2. C

3. B

4. A

1) A

2) C

3) B

4) A

1. A. wash

   B. warm

   C. wall

   D. walk

2. A. pan

    B. bag

    C. water

    D. add

3. A. sauce

    B. aunt

    C. caught

    D. daughter

4. A. document

    B. naughty

    C. audience

    D. water

Câu 6: D

Câu 7: C

6 D

7 C

8 C

9 D

10 A

11 C

1 watching

2 doing

3 sleeping

4 working

5 studying

6 talking

7 going

8 eating

9 telling

10 having

11 spending

12 taking

13 lending

14 waiting

15 doing