- Hợp chất vô cơ: CO₂, Na₂CO₃ 

- Hợp chất hữu cơ: 

+ Hiđrocacbon: C₄H₁₀, C₆H₆, C₃H₄ 

+ Dẫn xuất của hiđrocacbon: C₃H₈O, CH₃Cl, C₆H₆Cl₆

I want to visit Da Nang, a beautiful city in central Viet Nam. It has many attractions like the Golden Bridge and Marble Mountains. It is famous for stunning beaches and fresh seafood. I like it because the atmosphere is very relaxing and the people are friendly.

Hi Nam,

I want to tell you about Tet holiday in Vietnam. It is our Lunar New Year where families gather together. People decorate houses and enjoy special food like banh chung. I find it interesting because the atmosphere is joyful and I can receive lucky money.

Best, Dat

5:

a: sin x=2*cosx

\(A=\dfrac{6cosx+2cosx-4\cdot8\cdot cos^3x}{cos^3x-2cosx}\)

\(=\dfrac{8-32cos^2x}{cos^2x-2}\)

b: VT=sin^4(pi/2-x)+cos^4(x+pi/2)+6*1/2*sin^22x+1/2*cos4x

=cos^4x+sin^4x+3*sin^2(2x)+1/2*(1-2*sin^2(2x))

=1-2*sin^2x*cos^2x+3*sin^2(2x)+1/2-sin^2(2x)

==3/2=VP

Nam : Hi Song !
Song : Hello Nam !
Nam : how are you ?
Song : i am fine . And you?
Nam : me too
Song :oh! Look that , ARE not Mai and Na right?
Nam : yes . Ehh Mai , Na
Mai and Na : huh
Nam : come on
Na : what's up?
SOng : coming to Lunar New Year, Do you have any plans?
Mai : yes . Everyyear there r many special occasions in VN, but TET holiday is considered the most significant event to vietnamese. In that time, all vietnamese family members try to come back their homes and get togheter.Last tet holiday, i also had a good time with my family.to prepare for tet, i n' my sister bought many things such as: new clothes, foods, fruits... We also bought much paints to repair my house. THe kumquat tree and peach flower are the most important things that can't lack in my family. after cleaning the house, my parents taught to make banh chung .it seemed so hard to me, but ...................
Everyyear there r many special occasions in VN, but TET holiday is considered the most significant event to vietnamese. In that time, all vietnamese family members try to come back their homes and get togheter.Last tet holiday, i also had a good time with my family.to prepare for tet, i n' my sister bought many things such as: new clothes, foods, fruits... We also bought much paints to repair my house. THe kumquat tree and peach flower are the most important things that can't lack in my family. after cleaning the house, my parents taught to make banh chung .it seemed so hard to me, but ...................
Nam : Will we have a party?
Na : That's a good idea!
Song : Ok
Mai: of course

Nam:hi,Phong

Phong:oh hi,how are you?

Nam:Iam fine thank you,and you

Phong:Iam OK

Nam:Who are there?

Phong:There are Mai and Anna

Mai and anna:hello

Nam:Nice to meet you!

Mai and anna:Nice to meet you too

Mai: what are you doing?

Phong:we are taking about cycling,are you cycling with them?

Mai:Great idea

Phong,Nam,Anna,Mai:Let's go

Do gấp quá nên mình làm nhanh dở thì đừng chê nhoa

bn đang thi thì tự lm nhé, kể cả KT hay là Thi thử

thi tự lm nhé