Tìm và sửa lỗi sai:

1, Do you mind take=> taking the book back to the library for me

2, I was watching TV then=> when the telephone rang and somebody knocked on the door

3, Some onranges have been buyed=> bought and put on the table

4, Thanks for invite=> inviting me to the water-fetching contest of your school

5, The grand prize is gave=> given to the team with the most points

6, Mom said that life is=> was more difficult when she was a young

7, Have you done your homework the teacher's=> the teacher gave yesterday yet?

8, Would you mind if i take=> took a photo of you and your family?

1. Which / most / suitable house / Mr. Lam / and / family ?

=>Which is the most suitable house for Mr.Lan and his family?

2. Uncle / farmer / and / grow / lot / vegetables / his farm.

=>My uncle is a farmer and he grows a lot of vegetables in his farm?

3. Who / the / fat / person / your group ?

=>Who is the fattest person in your group?

Thể tích nước ban đầu là:

      30x15x8=3600 (cm³)

Sau khi thả viên gạch vào, mực nước tăng là:

      11,5-8=3,5 (cm)

Thể tích phần nước tăng là:

       30x15x3,5=1575 (cm³)

Thể tích viên gạch là:

        3600-1575=2025 (cm³)

                   Đáp số: 2025 cm³

\(\left|x-2\right|\ge0;\left|x\left(2-x\right)\right|\ge0\) với mọi x E R

\(\Rightarrow\left|x-2\right|+\left|x\left(2-x\right)\right|\ge0\) với mọi x E R

theo đề: |x-2|+|x(2-x|=0

<=>|x-2|=|x(2-x)|=0

<=>x=2 hoặc x=0

Vậy....
 

đenta=2^2-4*(-m^2+2m)

=>x₁=.....;x₂=..........................

thay vô  x₁²-x₂²=10 giải ra m

Dear Joan,

My parents and i are having the (1.good) .......best.................... holiday of on lives! We are in Vung Tau beach, one of the ( lovely ) ......most lovely......... ..... ........................... beaches in Vietnam. Although it is much ( small ) .......smaller................................... than Qui Nhon beach, and there seems to be ( much ) ..........more..................... interesting things to do than in Qui Nhon. Moreover, the people here seem to be ( friendly ) ...................friendlier........................ than thoes in other cities. We are staying in the ( modern ) .............most modern.................. hotel I have ever been. It's large and cool, and many people say that it's the ( good ) ........best.................... hotel in this city. It's ( big ) ..........bigger........... and ( comfortable ) .......more comfortable..................... than any of other hotels. The ( near ) ..........nearest........... beach is ( little ) .........less....................... than a hundred meters away and so we can go swimming a lot. It's really good, and I wish you were here with my family now.

Love,

Hung

A = (n+1)/(n-3) = (n-3+4)/(n-3) = 1 + 4/(n-3) 
A là ps tối giản <=> 4/(n-3) là ps tối giản <=> n-3 là số lẻ <=> n là số chẵn 
Trả lời : n = 2k (k thuộc Z)