1989 . 1990 + 3978 1992 . 1991 − 3984  ⇒  1989 . 1990 + 1989 . 2 1992 . 1991 − 1992 . 2  ⇒  1989 . ( 1990 + 2 ) 1992 . ( 1991 + 2 )    ⇒  1989 . 1992 1992 . 1989  ⇒  1

dấu chấm là dấu nhân

$\left(1989.1990+3978\right):\left(1992.1991-3984\right)$

$=\left[1989.\left(1990+2\right)\right]:\left[1992\left(1991-2\right)\right]=\left(1989.1992\right):\left(1992.1989\right)=1$

3958102.003

đây là kết quả nha

:Does your father work in the farm ?

- Yes,he does

Đây là câu trả lời nha ...........

I. Supply the correct form of the verbs in the brackets

1. My father and Mr Hung (work) work in a big factory in Hue

2. Hoa (not live) doesn't live in the city

3. Jack (watch) watches TV after doing his homework every night

4. How ..does... miss Lien (travel) travel to work ?

VIII. Read and circle the best option

1. A.  B. a cup 

2. C. anything

3.  D. milk

4. A. at 

5. C. dinner

6. A. meat 

7.  C. juice 

8.  B. restaurant 

9. A. get 

10. D. lot of

1.Does your mother driver

2.brings

3.did not work

4.left

5.laughs

6.talks

7.drived

8.weared

9.wrote

10.gives

1:excited

2:length

3:chemist

4:activities

5:friendly

6: sleepy

7 :friendly

8 :easily

9 :careful

10: taste

nhớ tích cho mình nha 

21+23+25+27+29+31+33+35

=[27+33]+[29+31]+35+25]+21+23

=60+60+60+21+23

=60x3+21+23

=180+21+23

=201+23

=224