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Ta có : 8 > 7 => -8 < -7 =>\(\dfrac{-8}{9}< \dfrac{-7}{9}\)

Ta có: 1<2=>-1>-2=>\(\dfrac{-1}{3}>\dfrac{-2}{3}\)

Ta có:3+6>0=>3>-6=>\(\dfrac{3}{7}>\dfrac{-6}{7}\)

Ta có: 0<0+3=>-3<0=>\(\dfrac{-3}{11}< \dfrac{0}{11}\)

=) x*(1+5)=504

=) x*6=504

=) x= 84

x+x.5=504

x.(1+5)=504

x.6=504

   x=504:6

   x=84

Vậy x=84

kb thì vô tcn rùi kb thui

ko đăng linh tinh

Chj k chắc đúng âu ( bài lấy trên mạng nhá )

I'm from a countryside. I have to go to Ho Chi Minh City in order to learn. I have been living here for 2 years. And I see differ between the City and countryside.
As you know the Saigon City has always been known to be a place of crowded and noisy as opposed to the countryside, where is a place of peace and quiet. It's too quiet to hear birdsong.
Life in the city is full of activity. Early in the morning everybody rush out of their homes. Start a new day with a coffee. Soon the streets are full of traffic. Shop and offices open, students go to school. The day's work begins.
Tourists, sightseers and other visit many places of the city such as museums, historic sites... while businessmen progress trade. In the countryside, the scattered houses among hundreds of plants. The City with high-rise buildings are built closely together. The roads are spread. It's hard to find a shade of tree in here.
The worker in the countryside leaved their homes early in the morning to work in the fields, catch fish in the streams or open small shop. While people work in the company, offices in the City.
Then towards evening, the office and day school begin to close. Many of store too close. Everyone seems to be a hurry to reach home. This is the cause of traffic accidents. With the coming of night. The streets are now full of colorful lights, the air is cooler and life becomes more leisurely in the evening.
Other than the countryside, who watches TV, listen to radio at home with their family. In the City, entertainment begins with watching film at the cinema, going to the park, playing tennis. Those who are interested in politics discuss the latest political. In here, the policeman patrol in order to warrant safety for the City.
Here, the drama of life enacted every day. Thieves and robbers more than in the countryside, they active all day. May be, the City is not absolutely quiet. As a result, the people of the city are usually better informed than those of the countryside, where information technology isn't developed. The city could, therefore, be described as a place of ceaseless activity. Progress in science and education has already begun to affect the countryside, hundreds of people are living the countryside to seek their fortunes in the city. And Saigon City, where is chosen. HCM city is the most populous, more and more increasingly. HCM city, where is called Prey Nokor. The city has been urbanization.
But I have to admit the HCM City is very beautiful, on holidays, Saigon becomes sparkling.
Did you arrive to Saigon?
I believed that when you arrived here, you would like the beauty of Saigon by night.

K đúng thì thoy nha ( cố gắng tìm lắm đó )

\(=\dfrac{\dfrac{3}{7}+\dfrac{3}{5}-\dfrac{3}{4}}{\dfrac{2}{5}-\dfrac{2}{4}+\dfrac{2}{7}}-\dfrac{\dfrac{1}{8}+\dfrac{1}{6}-\dfrac{1}{2}}{\dfrac{3}{6}-\dfrac{3}{2}+\dfrac{3}{8}}=\dfrac{3}{2}-\dfrac{1}{3}=\dfrac{7}{6}\)

rút gọn

= \(\dfrac{3}{2}-\dfrac{1}{3}\)

= \(\dfrac{7}{6}\)

like playing soccer, don't you
goes to school late, doesn't he
can swim very well, can't you
is going to the party, isn't she
was published in Germany in 1550, wasn't it
are sold all over the world, aren't they
have been built this year, haven't they
was given a book, wasn't he 
were bought by Mrs Brown yesterday, weren't they
is used everyday, isn't it

18x(x-16)=18

x-16=18:18

x-16=1

x=16+1

x=17

18x(x-16)=18

          x-16=18:18

          x-16=1

              x=16+1

              x=17