Bài 1:

1: ĐKXĐ: x∈R

2: ĐKXĐ: x∈R

3: ĐKXĐ: x-5<>0

=>x<>5

4: ĐKXĐ: 3x+6<>0

=>3x<>-6

=>x<>-2

5: ĐKXĐ: (x+1)(x-3)<>0

=>\(\begin{cases}x+1<>0\\ x-3<>0\end{cases}\Rightarrow\begin{cases}x<>-1\\ x<>3\end{cases}\)

6: ĐKXĐ: \(4-x^2<>0\)

=>\(x^2<>4\)

=>x∉{2;-2}

a: \(x+\dfrac{3}{9}=\dfrac{7}{6}\cdot\dfrac{2}{3}\)

=>\(x+\dfrac{1}{3}=\dfrac{14}{18}=\dfrac{7}{9}\)

=>\(x=\dfrac{7}{9}-\dfrac{1}{3}=\dfrac{7}{9}-\dfrac{3}{9}=\dfrac{4}{9}\)

b: \(x-\dfrac{2}{3}=\dfrac{1}{8}:\dfrac{5}{4}\)

=>\(x-\dfrac{2}{3}=\dfrac{1}{8}\cdot\dfrac{4}{5}=\dfrac{1}{10}\)

=>\(x=\dfrac{1}{10}+\dfrac{2}{3}=\dfrac{3+20}{30}=\dfrac{23}{30}\)

TThế giới oi oi oi 

Bài 1:

a. \(p=dh=10300\cdot36=370800\left(N/m^2\right)\)

b. \(160cm^2=0,016m^2\)

\(p=\dfrac{F}{S}\Rightarrow F=S\cdot p=0,016\cdot370800=5932,8\left(N\right)\)

Bài 2:

Ta có: \(p_2>p_1\left(1165000>875000\right)\)

\(\Rightarrow\) Tàu đăng lặn xuống, vì khi càng xuống áp suất lại càng tăng.

\(\left\{{}\begin{matrix}p'=dh'\Rightarrow h'=\dfrac{p'}{d}=\dfrac{875000}{10300}\approx84,9\left(m\right)\\p''=dh''\Rightarrow h''=\dfrac{p''}{d}=\dfrac{1165000}{10300}\approx113\left(m\right)\end{matrix}\right.\)

Bài 3:

\(20cm=0,2m\)

\(p=dh=8000\cdot\left(1,8-0,2\right)=12800\left(N/m^2\right)\)

Bài 4:

\(p=dh=10000\cdot2,8=28000\left(N/m^2\right)\)

\(150cm^2=0,015m^2\)

\(p=\dfrac{F}{S}\Rightarrow F=S\cdot p=0,015\cdot28000=420\left(N\right)\)

(x-2)³=216

=>\(\left(x-2\right)^3=6^3\)

=>x-2=6

=>x=8

x=8

Five years ago, I attended a very big festival in Ha Noi. It’s called 1000th Anniversary of Thang Long – Ha Noi Festival. There are a lot of activities in this festival such as fireworks display, military parade, music performances, ect. It was organized very splendidly because the organizers are the Viet Nam government. Millions of people came to Ha Noi to participate in this great festival. It was held for ten days from October 1st 2015 to October 10th 2015. I saw lots of fireworks, parties, parades during these days. It was interesting. I took so many pictures on this festival because there were plenty of beautiful scenes. We organized this great festival to celebrate the 1000th anniversary of Thang Long – Ha Noi.

My name is Yoshikage Kira. I'm 33 years old. My house is in the northeast section of Morioh, where all the villas are, and I am not married. I work as an employee for the Kame Yu department stores, and I get home every day by 8 PM at the latest. I don't smoke, but I ocassionaly drink. I'm in bed by 11 PM, and make sure I get eight hours of sleep, no matter what. After having a glass of warm milk and doing about twenty minutes of stretches before going to bed, I usually have no problems sleeping until morning. Just a baby, I wake up without any fatigue or stress in the morning. I was told there were no issues at my last check-up. I'm trying to explain that I'm a person who wishes to live a very quiet life. I take care not to trouble myself with any enemies, winning and losing, that would cause me to lose sleep at night. That is how I deal with society, and I know that is what brings me happiness. Althought, if I were to fight I wouldn't lose to anyone.