Số p⁴ có 5 ước số tự nhiên là 1 , p, p² , p³ , p⁴
Ta có : 1 + p + p² + p³ + p⁴ = n²     (n ∈ N)
Suy ra : 4n² = 4p⁴ + 4p³ + 4p² + 4p + 4 > 4p⁴ + 4p³ + p² = (2p² + p)²
Và  4n² < 4p⁴ + p² + 4 + 4p³ + 8p² + 4p = (2p² + p + 2)².
Vậy : (2p² + p)² < (2n)²  < (2p² + p + 2)².
Suy ra :(2n)² = (2p² + p + 2)² = 4p⁴ + 4p³ +5p² + 2p + 1

vậy 4p⁴  + 4p³ +5p² + 2p + 1 = 4p⁴ + 4p³ +4p² +4p + 4   (vì cùng bằng 4n² )

=> p² - 2p - 3 = 0  => (p + 1) (p - 3) = 0

do p > 1  => p - 3 = 0   => p = 3

Bạn nào giải thích cho mình phần in đậm

1.            Volcanic eruptions are one of the most destructive _____  disasters. (nature)

2.            The two teachers have _______ expectations of their students. (difference)

3.            The most disastrous _______        in Japanese history damaged Tokyo and Yokohama. (earthquakes)

4.            Many kinds of plants and animals are……………  (protect)

5.  …………may result in childhood cancer.( Radiate)

6. Never get _______ till tomorrow what you can do today.

A.  off    B.  over                 C.  out   D.  away

7.            Thanks _______ the financial aid he received, he was able to attend the university.

A. with               B. to          C. about               D. of

8.            I hope the weather good. _______ we’ll have to cancel the pinic.

A. However        B. Although        C. Therefore      D. Otherwise

9.            The car would survive the tornado if it ____on the other side of the road.

A. parked            B. had parked    C. were parked                 D. had been parked

10.          I can remember _______ the letter. I posted it on Friday morning.

A. post                  B. posting            C. to post             D. have posted

Ai học lớp 8 thi violymic toán tiếng việt cho mình biết mã đc ko

Across

3. Everyone likes Adam. He's _____.(7 chữ)

4. Pam only cares about herself. She's _____.(7 chữ)

5. I hate waiting for anything. I'm _____.(9 chữ)

6. Molly's always smiling. She's _____.(8 chữ)

8. Pete always gives things to people. He's _____.(8 chữ)

Down

1. Steve always tells people what to do. He's _____.(5 chữ)

2. Sally loves to chat. She's _____.(9 chữ)

7. Alan always tells the truth. He's _____.(6 chữ)

9. Clara is always doing something! She's _____.(9 chữ)

Viết lại câu

I get up too late to see the sunrise. (early)

My sister isn't tall enough to reach the shelf. (short)

The baby is too young to walk. (old)

These jeans are too small for me. (big)

>

Viết lại câu

I get up too late to see the sunrise. (early)

My sister isn't tall enough to reach the shelf. (short)

The baby is too young to walk. (old) 

These jeans are too small for me. (big)