viết chữ to quá mình ko biết

she /going  /vacation /?/where /is /spend /her /to /summer/

=> Where is she going to spend her summer vacation

There are some pictures .........on.......... the wall

This is Mary .She is a ____student____ at Doan Thi Diem primary. Now , she is _____having_____ a ____science_______ lesson . It is her favorite _____subject____.She is _____doing____ a text on zoo animals .Yesterday , she didn't go to school ____because_______ she had a fever.

Sắp sếp các từ thành câu hoàn chỉnh : 

1. favorite / school / my / favorite / subject / at / math / is .

Math is my favourite at school.

2. listening / is / he / music / to.

He is listening to music.

3. hot / sunny / Ha Noi / it / and / is / in

It is hot and sunny in Ha Noi.

Write the correct form of the word in parentheses in each sentence

1, The train stopped    suddenly               (sudden)

2, I opened the door                slowly    (slow)

3, Sue is very           quite    (quiet)

4, Please listen       carefully         (careful)

5, I understand you     perfectly           (perfect)

6 , Be          careful         ( careful)

7, It was a        bad         (bad) game

8, It rainning             heavily         (heavy)

9, Out team played                  badly          (bad)

10, Sue speaks very            qiuetly              (quiet)

He often goes swimming ______in_______ spring

n⁴ + 4 = (n²)² + 4.n² + 4 - 4.n^2​  = (n² + 2)² - (2n)² = (n² + 2 - 2n)(n² +2 + 2n) = [(n -1)² + 1].[(n + 1)² +1] 

Nếu n = 1 thì n⁴ + 4 = 1.5 = 5 là số nguyên tố

Nếu n>1 thì n⁴ + 4 là tích của hai số lớn hơn 1 là [(n -1)² + 1]. và [(n + 1)² +1] . Khi nó nó không phải là số nguyên tố.

ĐS: n = 1