Gọi số ngày 28 công nhân xây hết 1 ngôi nhà là x 

Vì năng suất của mỗi công nhân như nhau

=> Số công nhân và số ngày là 2 đại lượng tỉ lệ nghịch

=> \(\frac{28}{35}=\frac{168}{x}\)

=> x = 168 . 35 : 28

=> x = 210

KL: 28 công nhân xây 1 ngôi nhà hết 210 ngày

hãy tìm ra 10 từ thừa trong bài văn sau

This is Tuan. He is me=>myclassmate. He gets up at a quarter to six. He brushes his teeth, takes a shower and get=>gets dressing=>dressed. He does have=>have breakfast, then he leaves the=>0 house at half past six. The school is near his house so he goes by=>on foot. Classes start at seven o'clock and ending=>end at half past eleven. He comes back house=>home and has lunch at twelve o'clock. It's eight o'clock in=>on Saturday evening now and Tuan is at home. He is on he's =>his room and he is playing video games. He is also listening to music at the same time. He is playing games and listens=>listening to the musical every Saturday and Sunday. Sometimes he go=>goes out and plays sports with his friends

1.a-2

b-4

2.traditison -> tradition

điền a, an, the, any hoặc 0 vào chỗ trống

1.There is ...an.... egg on ...the... table

2.My yard doesn't have ....any..... trees

3.Is your mother staying at ....0...... home

- Yes. She's in ...the.... kitchen

4.My sister is ....a... nurse. She goes to ...0.... work every day

5.Are there ...any..... hotels in your street?

6.Our city has ....a..... university and ..an....... ancient temple

thì hiện tại đơn và hiện tại tiếp diễn

1 where .....do....... you (live )......live..........?

I ( live ) .......live.......... in Hai Duong town.

2 what .....is........... he ( do ) .........doing...........now ?

He ( water ) ..........is watering............ flowers in the garden.

3 what .........does....... she ( do ) .......do...............?

She ( be ) ................is.............a teacher.

4 where .............are........... you ( be ) from ?

5 what time .......do......... they ( get up ) .........get up..................?

6 what .......do.......... they ( do ).........do.............in the winter?

7 her favouriter subject ( be ) ..........is............... English

8 Now . my brother ( like ) .........likes................eating bananas.

9 look! aman ( call ) ..........is calling........... you .

1-c

2-b

3-a

4-d

5-a

1-a

2-a

3-a

4-b

5-c

1.He usually (go )....goes..........fishing on Saturdays

2.My brother used to (go).......go......to work by motorbike.Now he cycles

3.How about (see)......seeing.......a movie on Sunday evening

4.An didn't use (play).........to play..............football in the afternoon.Now he often does it

5.Nam (learn).........has learnt.............English for 8 years

6.Last night ,my father(watch) ......watched...........TV

7.Ba (visit).........is going to visit.......to Ha Long Bay this summer vacation

8. I like (work)........working........as a voolunteer for that orphanage

1/a,24300; 3700; 4800;                             b, 350;43;740;     c,1/10 ;1/100; 1/1000

2/a,2060 ;407;54m5dm;4km73m                                           

3/a,7200, 400000, 370000000,

   b,7,350,270,             c,4kg36g; 0,008tan 0,025kg.         d,3kg820g; 4tan372kg