Viết lại câu sao cho nghĩa không đổi :
1, Nga enjoys listening to traditional stories.
=> Nga is
2, It's necessary to resive new words regularly.
=> You
3, It isn't necessary for you to finish the work by Saturday.
=> You don't

Tìm lỗi sai và sửa lại :
1, Do American students have more vacations a year than Vietnamese one ?
2, In the future robots do all the housework for me and you.
3, A farmer needs feeding the animals every day of the year.
4, Mr.Thanh doesn't live in the country, and we don't, too.
5, Peter's teacher asked his mother pay more attention to his study at home.
6, She buys him an alarm clock last week.
7, I'm going to being home late tonight.
8, There are some milk in the fridge.
9, The shopkeeper asked the boys don't lean their bikes against his window.
10, Let's stop to work for a while. I'm getting tired.

Write a paragraph of about 100-120 words to support the idea : " With the help of computers and internet, students will benefit greatly from studying by themselves at home".
1. I/ agree / idea that/ students / benefit / great / studying / themselves / home / help / computers / internet.
2. Firstly / they / can / get important information / lessons / internet./ Internet/ have/ great sources / information/ every field / so / they / get information / they / need / short time.
3. Secondly, / they/ communicate / teachers / or friends/ ask them/ difficult problems / can't solve. This way/ communication / cheaper/ any others.
4. Finally, / study/home/help/students/active/do/learning and working./They / can do/ this/ any suitable time / so that/ they / can save/ lot / time
5. In conclusion, students / have / advantages / when/they/use/modern technology/study/home

Hoàn thiện các câu sau :
1. I/ agree / idea that/ students / benefit / great / studying / themselves / home / help / computers / internet.
2. Firstly / they / can / get important information / lessons / internet./ Internet/ have/ great sources / information/ every field / so / they / get information / they / need / short time.
3. Secondly, / they/ communicate / teachers / or friends/ ask them/ difficult problems / can't solve. This way/ communication / cheaper/ any others.
4. Finally, / study/home/help/students/active/do/learning and working./They / can do/ this/ any suitable time / so that/ they / can save/ lot / time
5. In conclusion, students / have / advantages / when/they/use/modern technology/study/home

Chứng minh rằng bất đẳng thức : \(a^4+1\ge a\left(a^2+1\right)\)

Cho a, b, c là độ dài ba cạnh của tam giác. Chứng minh rằng : \(a^2+b^2+c^2< 2\left(ab+bc+ac\right)\)

Viết lại câu với các từ trong ngoặc :
1. He can't understand what she has said because he doesn't know English ( if / so / because of )
2. The thermal pollution happens when there is a change in the water temperature ( cause / result / due to )

Cho tam giác ABC có góc A= 120 độ, AD là đường phân giác. CMR : 1/AB+1/AC=1/AD

Cho biết độ dài AB gấp 5 lần độ dài CD và độ dài A'B' gấp 15 lần độ dài của CD. Tính tỉ số của hai đoạn thẳng AB và A'B'