Nguời ta thả 1 vật đặc bằng kim loại có trọng luợng 7,8N và thể tích 100cm^3 vào 1 chậu nước.Cho lượng riêng của nuớc là10000N/m^3

a) Tính lực đẩy acsimet tác dụng lên vật

b)XÁc định khối lượng riêng của chất làm nên vật

c) Khi thả vật vào thủy ngân thì vật đó chìm hay nổi? Vì sao?Cho trọng luợng riêng của thuye ngân là 136000N/m^3

Nêu sự sai khác cơ bản giữa cá đẻ con và thú đẻ trứng

Câu bị động

1)Did you meet your grandparents at the station last Sunday?

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2)These students haven't written the compositions yet

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3)Has your elder brother watched this play several times?

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4)When will they pull this old bulding down?

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5)Why didn't you invite Kate to the party last month?

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6)Her parents always encourage her to focus on her study.

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7)The sudden flood damaged our crops.

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8)Have you ever met this movie star?

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9)Will you phone her when she comes to London?

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10)Who wrote "Gulliver's Travels"?

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11) Was Mary reading a magazine when her mother phoned?

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Tim x

1/2.x+3/5.(x-2)=3

Viết 1 bài văn ngắn nói lên suy nghĩ của em về trái đất

Tính A+B

A= 1.99+2.98+3.97+.............+99.1

B=1.101+2.102+3.103+............+99.199

so sánh P và Q

P=2016/2017+2017/2018

Q= 2016+2017+2018/2017+2018+2019

Tính

A=1.(100-1)+2.(100-2)+3.(100-3)+..............+99.(100-99)

B=1.(100+1)+2.(100+2)+3.(100+3)+...........+99.(100+99)

điền từ vào đoạn văn

exercise is one of the best way to keep fit. It (.1)........... the heart and lungs strong and helps to prevent illness. Doctors recommend exercising(2)........... thirty minutes a day, three times a week.(3) ............sports, qalking,jogging,cycling and swimming are all good forms of exercise. You don't need(4)............ buy expensive clothes, but a good pair of shoes is(5) ............ advantage for jogging and walking. As many people cycle long distances to work every day, they(6)............ fit without needing to do extra exercises

Diet is another important(7) ............. to keep healthy. A balanced diet contains meat, fish, eggs, rice, vegetables and fruit. It is better to eat more to eat more of this type of food and lessfood containing fat (8)............. sugar .Cake,eggs,and soft drinks.(9).......... fattening and bad for the teeth.smoking is dangerous for your (10).............. and alcohol should only be drunk in small quantities

viết lại câu

mrs quynh wrote the letter in twenty minutes

mrs quynh

it takes six hours to drive phutho to ha long bay

it is a

how heavy is the chicken?

what is

shall i bring you a cup of coffee?

would you

i advise you to learn harder

you'd

chọn dạng đúng của từ

as a child i was ............ of the dentist(scare)

my grandfather has VERY ..........tooth(pain)

tim loi sai va sua lai

there are a lot of sports activity to take part in

in the 1990s basketball suddent became popular

she is thirsty she would like drinking something

i spent the whole afternoon to play football wuth my classmates

hoan thanh cau

david/buy/lot/differnt/gifts/his friends/america/yesterday

i/not like/eat.eggs/and/brother/either

hoa/often spend/spare time/read/books/own room

why/some/people/think/students/have/easy life?

dad/i/hope/visit/uou/ha noi soon probably/after/harvest