Ta có :

(x+3)^4=4*(x+3)^3

hay (x+3)^4-4*(x+3)^3=0

(x+3)^3*(x+3−4)=0

(x+3)^3*(x−1)=0

TH1: x+3=0⇒x=−3

TH2: x−1=0⇒x=1

Vậy x=-3 hoặc x=1

(3+x)^4 = 4*(x+3)^3

(3+x)^3 * [(3+x) - 4] = 0

(3+x)^3 * (x - 1) = 0

x = -3 hoặc x = 1

1. 1. D. singer The "er" in "singer" is pronounced differently from the "ur" sound in the other words.
2. 2. D. above The "o" in "above" is pronounced differently from the other words, which have a short "o" sound.
3. 3. A. mother The "o" in "mother" is pronounced differently from the other words, which have a long "e" sound.
4. 4. B. about The "ou" in "about" is pronounced differently from the other words, which have a short "o" sound.
5. 5. C. person The "er" in "person" is pronounced differently from the other words, which have a long "u" sound.

• 1. burn, hurt, birth, singer: The "ur" sound in these words is pronounced differently. In "singer," the "er" is pronounced more like a long "e".
• 2. love, colour, opinion, above: The "o" sound in "above" is pronounced differently. It's a diphthong (two vowel sounds blended together), while the other words have a short "o" sound.
• 3. mother, badminton, learn, picture: The "o" sound in "mother" is pronounced differently. It's a short "o" sound, while the other words have a long "e" sound.
• 4. hobby, about, collect, player: The "ou" sound in "about" is pronounced differently. It's a diphthong, while the other words have a short "o" sound.
• 5. surfing, future, person, girl: The "er" sound in "person" is pronounced differently. It's more like a long "e", while the other words have a long "u" sound.

1. A. burn | B. hurt | C. birth | D. singer

- A, B, C: /ɜː/ sound in “burn”, “hurt”, “birth”

- D: “singer” has /ə/ sound

Đáp án: D. singer

2. A. love | B. colour | C. opinion | D. above

- A, B, D: "o" pronounced as /ʌ/ like in “love”, “colour”, “above”

- C: "o" pronounced as /ə/ in “opinion”

Đáp án: C. opinion

3. A. mother | B. badminton | C. learn | D. picture

- A, C: "th" & "ea" pronounced /ɜː/

- B, D: short /ɪ/ or schwa sounds

Đáp án: C. learn

4. A. hobby | B. about | C. collect | D. player

- A, C, D: “o” or “a” are stressed clearly

- B: “a” in “about” is a schwa /ə/

Đáp án: B. about

5. A. surfing | B. future | C. person | D. girl

- A, C, D: /ɜː/ sound

- B: “future” has /juː/ sound

Đáp án: B. future

\(\left(\frac17\right)^{x+1}\) \(=\frac{1}{49}\)

\(\left(\frac17\right)^{x+1}\) \(=\left(\frac17\right)^2\)

\(x+1=2\)

\(x=2-1\)

\(x=1\)

LMV gamer ơi, cậu thông minh thế

1 B

2 B

3 B

4 A

5 C

6 B

7 C

8 A

9 C

10 B

\(\frac{-30}{17}:\frac{-15}{-34}\)

\(=-\frac{30}{17}:\frac{15}{34}\)

\(=-\frac{30}{17}\cdot\frac{34}{15}=-\frac{34}{17}\cdot\frac{30}{15}=-2\cdot2=-4\)

\(\frac{-30}{17}:\frac{-15}{-34}\)

\(=\frac{-30}{17}:\frac{15}{34}\)

\(=\frac{-30}{17}.\frac{34}{15}\)

\(=\frac{-1020}{255}\)

\(=-4\)

Olm chào em, cảm ơn đánh giá của em về chất lượng bài giảng của Olm, cảm ơn em đã đồng hành cùng Olm trên hành trình tri thức. Chúc em học tập hiệu quả và vui vẻ cùng Olm em nhé!

Hay lắm bạn ơi! Bạn viết bài văn mà mik mới nhớ ra hôm này là Ngày Dân số Thế giới đó!

hay quá bạn

ta có ( x+1) + ( x+2 ) +( x+3 ) + (x+4) = 5x

suy ra 4x + 10 = 5x

nên x=10

KL: vậy x=10

bạn ơi |x+1|+|x+2|+|x+3|+|x+5| nhé

Ta có:|x - 1| + |3x - 3| + |5x - 5| + |7 - 7x| = 32

|3x - 3| = 3|x - 1|
|5x - 5| = 5|x - 1|
|7 - 7x| = 7|x - 1|

Suy ra 16|x - 1| = 32 → |x - 1| = 2

Suy ra x = 3 hoặc x = -1

Ta có: |x-1|+|3x-3|+|5x-5|+|7-7x|=32

=>|x-1|+3|x-1|+5|x-1|+7|x-1|=32

=>\(16\cdot\left|x-1\right|=32\)

=>|x-1|=2

=>\(\left[\begin{array}{l}x-1=2\\ x-1=-2\end{array}\right.\Rightarrow\left[\begin{array}{l}x=2+1=3\\ x=-2+1=-1\end{array}\right.\)

We will be chatting with her friends tonight

We/ be/ chat/ her friends/ tonight.

→ We will be chatting with her friends tonight.