Các loại môi trường tự nhiên của châu Phi là:
- môi trường xích đạo ẩm
- môi trường nhiệt đới
- môi trường hoang mạc
- môi trường địa trung hải và ở phần cực Bắc và phần cực Nam Châu Phi

\(a,=\left(x+4\right)^3=\left(6+4\right)^3=10^3=1000\\ b,=x^3-1+x^3-27=2x^3-28\\ =2\left(-1\right)^3-28=-2-28=-30\\ c,=\left[4x-6-4\left(3-x\right)\right]\left[4x-64++4\left(3-x\right)\right]=6\left(8x-18\right)=12\left(4x-9\right)\\ =12\left(-7\cdot4-9\right)=12\left(-37\right)=-444\)

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

Nếu chê thì sao ? 😂

8dm3 nhé

8dm3 bạn nhé

1: \(\Leftrightarrow x-2-7x+7=-1\)

=>-6x+5=-1

hay x=1(loại)

3: \(\Leftrightarrow\left(x+2\right)\left(x-1\right)-\left(x+1\right)\left(x+3\right)=4\)

\(\Leftrightarrow x^2+x-2-x^2-4x-3=4\)

=>-3x=9

hay x=-3(loại)

4: \(\Leftrightarrow x^2+2x+1-x^2+2x-1=3x\cdot\dfrac{x+1-x+1}{x+1}\)

\(\Leftrightarrow4x=\dfrac{6x}{x+1}\)

\(\Leftrightarrow4x^2+4x-6x=0\)

\(\Leftrightarrow4x^2-2x=0\)

=>2x(2x-1)=0

hay \(x\in\left\{0;\dfrac{1}{2}\right\}\)

Gọi quãng đg 3 xe chạy lần lượt là a,b,c (km)(a,b,c>0)

Vì vận tốc tỉ lệ với 3;4;5 nên quãng đường tỉ lệ với 5;4;3 \(a:b:c=5:4:3\Rightarrow\dfrac{a}{5}=\dfrac{b}{4}=\dfrac{c}{3}\) và \(a-c=20\left(km\right)\)

Áp dụng t/c dtsbn:

\(\dfrac{a}{5}=\dfrac{b}{4}=\dfrac{c}{3}=\dfrac{a-c}{5-3}=\dfrac{20}{2}=10\\ \Rightarrow\left\{{}\begin{matrix}a=50\\b=40\\c=30\end{matrix}\right.\)

Vậy ...

a^3+b^3+c^3=3abc thì a=b=c hay a+b+c=0 chứ sai đề r

a^3 + b^3 + c^3 - 3abc = (a+b+c)(a^2+b^2+c^2-ab-bc-ca) 

Nếu bài này là a³+b³+c³=3abc thì giả như này

từ đề => (a+b+c)(a²⁺b²+c²-ab-bc-ac)=0

<=>a+b+c=0 hay a^2+b^2+c^2-ab-bc-ac=0

                          2a^2+2b^2+c^2-2ab-2bc-2ac=0

                          (a-b)^2+(b-c)^2+(c-a)^2=0

                       =>a-b=0,b-c=0,c-a=0

                       =>a=b=c

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