cảm xúc của em là... rất chán nản.

Rất vui, Khi gặp lại mái trường và gặp lại những người bạn thân yêu

                  Giải

Ta có : \(\hept{\begin{cases}x\left(x+y+z\right)=-5\\y\left(x+y+z\right)=9\\z\left(x+y+z\right)=5\end{cases}}\Rightarrow x\left(x+y+z\right)+y\left(x+y+z\right)+z\left(x+y+z\right)=-5+9+5\)

\(\Rightarrow\left(x+y+z\right)\left(x+y+z\right)=9\)

\(\Rightarrow\left(x+y+z\right)^2=3^2\)

\(\Rightarrow x+y+z=3\)

\(\Rightarrow\hept{\begin{cases}3x=-5\\3y=9\\3z=5\end{cases}}\Leftrightarrow\hept{\begin{cases}x=\frac{-5}{3}\\y=3\\z=\frac{5}{3}\end{cases}}\)

Mà x , y , z là các số nguyên nên không có nghiệm x , y , z cần tìm

1.'chí' trong câu trên khác 'trí ' ở chỗ âm đầu 1 cái là 'ch' 1 cái là 'tr'

2.'chí' trong câu trên khác 'trí ' ở chỗ 'chí' trong câu trên là 'chí bền' còn 'trí' là 'trí khôn'

Thì hiện tại đơn: Are you a student? - Yes, Iam

Thì quá khứ đơn: Were they at home yesterday?-No, they weren't

Thì hiện tại tiếp diễn: Is she reading a book? -Yes, she is

thì tương lai đơn: Will you come here tomorrow?-No, I won't

Ý kiến riêng. 

1. Present Simple

♡Is your brother a doctor? ~ No, he isn't.

♡What do you do? ~ I'm an engineer.

♡Do you use smartphone in class? ~ No, I don't.

♡Does Tim teddy bear? ~ Yes, he does.

♡ What do you think about this paragraph? ~ I think it's rather good.

2. Past Simple

♡What did you do after school? ~ I played tennis.

♡Did you listen to music when you was young? ~ Yes, I did

♡Where did you go at ten minutes ago? ~ I went to the bedroom.

♡When did she get married? ~ She got married in 1999.

♡Who did you meet yesterday? ~ I met Mr.Phong yesterday.

3. Present Progressive

♡What are you looking for? ~ I'm looking for my glasses.

♡Who are you talking about in class? ~ I'm talking about Tom.

♡What kinds of music is he listening? ~ He is listening pop and rock music.

♡What are you playing? ~ I'm playing badminton.

♡Who is your mother going with? ~ She is going with my aunt.

4. Future Simple

♡Where will you go on this vacation? ~ I will go to Da Lat.

♡What will you do to help her? ~ I will call the taxi for her.

♡Who will you travel with? ~ I will travel with Miss Lan.

♡Where will you visit in London? ~ I will visit some famous museums.

♡What will you write? ~ I will write a letter for my sister.

\(^{x^{ }^3-2x^2=0}\)

\(\Leftrightarrow x^2\left(x-2\right)=0\)

\(\Leftrightarrow x^2=0\)hoặc   \(\left(x-2\right)=0\)

\(1,x^2=0\Leftrightarrow x=0\)

\(2,\left(x-2\right)=0\Leftrightarrow x=2\)

Vậy x=0 hoặc x=2