1. Meloday (giai điệu) : What I love about this song is its melody

2. Symphony (giao hưởng): Beethoven's Fifth Symphony is considered one of the greatest muscial works

3. Lyric (lời bài hát): One Direction is a band famous for songs with meaningful lyrics

4. Note (nốt nhạc): Many people find it difficult to sing high notes

5. Rock n' roll (nhạc rock): Believer by Imagine Dragons is a famous rock n' roll song

\(x^2 - 4x - 3 = 0\) có 1.(-3) < 0

=> Phương trình có hai nghiệm phân biệt

Áp dụng hệ thức Vi-et có \(x_1 + x_2 = 4\)    \(; x_1x_2 = -3\)

Mà \(A = \dfrac{x_1^2}{x_2} + \dfrac{x_2^2}{x_1}\)

\(= \dfrac{x_1^3 + x_2^3}{x_1x_2}\)

\(= \dfrac{(x_1 + x_2)(x_1^2 - x_1x_2 + x_2^2)}{x_1x_2}\)

\(=\dfrac{(x_1+x_2)[(x_1 +x_2)^2 - 3x_1x_2]}{x_1x_2}\)

\(=\dfrac{4.[4^2 - 3.(-3)]}{-3}\)

\(= \dfrac{-100}{3}\)

a. He told me how to do my homework

b. She decided to visit Hanoi

c. Nga showed Lan where to buy pens

1. friends

2. badminton

3. swimming

4. taking

1. What is your phone number?

2. Where are you going?

Diện tích bề mặt Trái Đất là \(S = 4\pi R^2 = 4\pi 6370^2 = 162307600\pi (km^2)\)

Diện tích của lục địa và băng là 

\(162307600\pi . 29.2\% \) xấp xỉ \(148892074.2 (km^2)\)

Để \(P \leq 4\) thì \(\dfrac{x}{\sqrt x- 1} \leq 4 (Đk: x \geq 0; x \neq 1)\)

=> \(x \leq 4(\sqrt x - 1)\)

<=> \(x - 4\sqrt x + 4 - 3 \leq 0\)

<=> \((\sqrt x- 2)^2 - 3 \leq 0\)

<=> \((\sqrt x - 2)^2 \leq 3\)

=> \(-\sqrt 3 \leq \sqrt x - 2 \leq \sqrt 3\)

=> \(-\sqrt 3 + 2 \leq \sqrt x \leq \sqrt 3 +2\)

=> \(7 - 4\sqrt 3 \leq x \leq 7 + 4\sqrt 3\)

Kết hợp với Đk của x => \(7 - 4\sqrt 3 \leq x \leq 7 + 4\sqrt 3\) và \(x \neq 1\)

Mình cảm ơn ạ

1. It's 3 years since I last met Nam -] I haven't.....met Nam for 3 years......

2. '' Don't make so much noise .'' Said Carol -]

Carol told Peter ......not to make so much noise...............

3. The did the work excellently -]

The work....was doen excellently...........

4. Although I'm short of money , I'll lend you some -]

In spite of....being short of money, I'll lend you some.........

5. She used to perform better than her friends did -]

Her friends never used to..........perform as well as her..........

sao mấy cái Latex bị lỗi à :((