1. competitions

2. friendship

1. competitions

2. friendship

3. performance

4. unbelieved

5. musician

6. disappeared

7. shortage

8. choice

9. religious

10. carefully

Trc khi tớ lm mong cậu đọc cho ''-.-'' : It's too long, I only did 3 sentences

1, I don’t candies either.

=> Neither do I durians

2, My sister usually plays badminton skillfully

=> My sister is usually a skillful badminton player

3, How much were these “chung” cakes?

=> What was the cost of these "chung" cake?

cảm ơn cậu^^

Ta có: \(\frac{1}{\sqrt{1}}>\frac{1}{\sqrt{100}}\)

\(\frac{1}{\sqrt{2}}>\frac{1}{\sqrt{100}}\)

\(\frac{1}{\sqrt{3}}>\frac{1}{\sqrt{100}}\)

 \(..............\)

\(\frac{1}{\sqrt{100}}=\frac{1}{\sqrt{100}}\)

\(\Rightarrow\frac{1}{\sqrt{1}}+\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+...+\frac{1}{\sqrt{100}}>\frac{1}{\sqrt{100}}+\frac{1}{\sqrt{100}}+\frac{1}{\sqrt{100}}+...+\frac{1}{\sqrt{100}}\)

\(\Rightarrow>100.\frac{1}{\sqrt{100}}=10\)

\(\Rightarrowđpcm\)

Làm tắt thôi, hôm trước vừa làm câu nỳ xong, hiểu thì tự trình bày nhé~

Đặt biểu thức trên là A.Ta có:

\(\frac{1}{\sqrt{1}}>\frac{1}{\sqrt{100}}\)

\(\frac{1}{\sqrt{2}}>\frac{1}{\sqrt{100}}\)

             ...

\(\frac{1}{\sqrt{99}}>\frac{1}{\sqrt{100}}\)

\(\frac{1}{\sqrt{100}}=\frac{1}{\sqrt{100}}\)

\(\Rightarrow\frac{1}{\sqrt{1}}+\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+...+\frac{1}{\sqrt{100}}>100.\frac{1}{\sqrt{100}}\)

                                                                                          \(=10\)

Vậy \(A>10\left(đpcm\right)\)

1. The old man walked..slow..................to the park. (slow, slowly, fast, fastly)

2. The man......whom.............sits next to Lan is my uncle.( who, whom, which, whose)

3. ....altthough.............it was rainy, we enjoyed our picnic very much. (But, So, Because, Although)

4. We have lived in this city......ago.................5 years( since, for, in, ago)

5. She hasn't.....ate............that kind of food before. (eat, ate, eaten, aten)

6. Your brother is studying, please ...turn off.............the TV. (turn on, turn up, turn off)

7. We should have a party to....... celebration...................this. (celebration, celebrate, decorate, decoration)

8. You watched TV late last night, .......didn't you........ jack ( do you, don't you, did you, )

.9. The novel was written .....by........Jack . (on , at, from, by)

10. The house has been built......from..............last year.(in , from, for, since) 

1. The old man walked....................to the park. (slow, slowly, fast, fastly)

2. The man...................sits next to Lan is my uncle.( who, whom, which, whose)

3. .................it was rainy, we enjoyed our picnic very much. (But, So, Because, Although)

4. We have lived in this city.......................5 years( since, for, in, ago)

5. She hasn't.................that kind of food before. (eat, ate, eaten, aten)

6. Your brother is studying, please ................the TV. (turn on, turn up, turn off)

7. We should have a party to.........................this. (celebration, celebrate, decorate, decoration)

8. You watched TV late last night, ......................?( do you, don't you, did you, didn't you)

9. The novel was written .............Jack . (on , at, from, by)

10. The house has been built....................last year.(in , from, for, since)

chúc bạn học tốt

chó đi i hay đi ỉa

|x+3| ≥ 0;|x+1| ≥ 0

=>|x+3|+|x+1| ≥ 0

Để |x+3|+|x+1|=3x thì 3x ≥ 0

⇒x ≥ 0 =>x+3 > 0 và x+5 > 0

Ta có: x+3+x+1=3x

=>(x+x)+(3+1)=3x

=>2x+4=3x

=>3x-2x=4

=>x=4

Vậy x=4  (thỏa mãn)

Ta có: \(\left|x+3\right|\ge0\) với \(\forall x\)

         \(\left|x-1\right|\ge0\)với \(\forall x\)

\(\Rightarrow\left|x+3\right|+\left|x-1\right|\ge0\)

\(\Rightarrow3x\ge0\Rightarrow x\ge0\)

\(\Leftrightarrow\hept{\begin{cases}\left|x+3\right|=x+3\\\left|x-1\right|=x-1\end{cases}}\)

\(\Rightarrow x+3+x-1=3x\)

\(\Rightarrow2x+2=3x\)

\(\Rightarrow2=3x-2x\)

\(\Rightarrow2=x\Rightarrow x=2\)

Vậy \(x=2\)

Hoan Kiem lake is in the centre of HaNoi

many famous school are named after Chu Van An - one of the famous teacher at the Imperial Academy 

one stone tablet was erected on the back of the tortoise after each Royal examination 

the reason why we will visit the Imperial Academy is that it is the first university in VietNam

Khleang Pagoda in Soc Trang was made from wood in 1533

Chúc bạn học tốt

tr

Hoan Kiem lake is in the centre of HaNoi

many famous school are named  after Chu Van An - one of the famous teacher at the Imperial Academy 

one stone tablet was erected on the back of the tortoise after each Royal examination 

thereason why we will visit the Imperial Academy is that it is the first university in VietNam

Khleang Pagoda in Soc Trang was made from wood in 1533

hok tốt