\(3x+xy+y+3=22+3\)

\(3\left(x+1\right)+y\left(x+1\right)=25\)

\(\left(3+y\right)\left(x+1\right)=25\)

\(\Rightarrow3+y;x+1\in\text{Ư}\left(25\right)\)

Bạn tự lập bảng rồi làm nhé 

2/ I'm sitting next to a boy./I'm not sitting next to a boy.

3/ The teacher's smiling./the teacher's not smiling

4/ We are studying maths./We are not studying maths.

5. The sun is shining./The sun is not shining

 6. I'm wearing trainers./I'm not wearing trainers.

7. My parents are working./ My parents are not working.

8. My friends and I are eating./ My friends and I are not eating.

Chúc bạn hok tốt

2. I am sitting next to a boy/ I am not sitting next to a boy.

3. The teacher is smiling/ The teacher isn't smiling.

4. We are studying maths/ We aren't studying maths.

5. The sun is shining/ The sun isn't shining.

6. I am wearing trainers/ I am not wearing trainers.

7. My parents are working/ My parents aren't working.

8. My friends and I are eating/ My friends and I aren't eating.

~ Học tốt~

dew23jqehynfw3ehbl

Tổng các ước nguyên tố của 520 là:20

\(3^4-5.4^2\)

\(=81-5.16\)

\(=81-80=1\)

\(63.73-27.63+37.73-27.37\)

\(=63.\left(73-27\right)+37.\left(73-27\right)\)

\(=63.46+37.46\)

\(=\left(63+37\right).46\)

\(=100.46=4600\)

2 câu ạ

he never gets up early so he is always for school late.

bạn ơi bạn có thể giải thích hơn dc ko (kiểu vì sao mà always rồi lại school late í) 

vĩ tuyến 0^o nhé