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23 tháng 3 2016

bài này là quy tắc dấu ngoặc nhưng mik lười đánh à

23 tháng 3 2016

P=y-[y-(2x-x-y)]=y-[y-x+y]=y-y+ x-y=x-y

Q=y-[y-x+2x-2y]=y-[-y+x]=y+y-x=2y-x

=>P+Q=x-y+2y-x=(x-x)+(2y-y)=y

=>P-Q=(x-y)-(2y-x)=x-y-2y+x=2x-3y

24 tháng 3 2016

rhreh

gjjjjjjjjjj

 

ggggggggggggg

 

 

 

 

 

ggggggggggggggg

 

 

 

 

 

 

gggggghhhhhhhhh

 

 

 

 

ffffffff

ayjrte

25 tháng 3 2016

Bạn ơi đây là NGOẠI NGỮ  mà!!!!

 

26 tháng 3 2016

đay là chỗ ngoại ngữbucqua

16 tháng 4 2016

DANG HOC NGOAI NGU  NHU MA CHEN TOAN VO MAY BI DIEN A THANG KIA

31 tháng 1 2018

about 80 words is

31 tháng 1 2018

Villages are a beauty and today`s generation is really missing the beauty of villages. Villages are so silent and calm and pollution free. Though I live in a city with the maddening crowd and sound, my parents used to live in villages and I have been there many times.Both my parents come from villages, and I look forward to go their places during my vacations. It is so calm and peaceful and the beauty of nature is just fantastic. With not many families around, they know each other so well, that they all almost live like a large family. You could step into your neighbor’s house at any time and you would be welcomed with yummy dishes and snacks. Though the transportation has advanced, there are still places where you need to walk.I remember, while visiting my grandmother’s place, we had to walk through the paddy fields to reach her home!! It was such an experience that I guess very few, who are of my age would have hadThe backwaters are another beauty to the villages. You have small streams that club to the lakes and backwaters. This stream water is so fresh and crystal clear. You could walk through them and the cool water just rushes over your feet and makes you feel so cool. Hours could be spent by simply sitting and admiring the beauty of nature.The sunset is a beautiful scene to be viewed.

31 tháng 5 2019

Bạn có thể vào CHTT tham khảo

Hok tốt

NHTP

đề sai

 

4 tháng 5 2016

uk mk cx thấy sai sao ý

24 tháng 3 2017

1,The history of these places interests me

I am interested in reading The history of these places

24 tháng 3 2017

I'm interested in the history of these places

21 tháng 10 2020

Ta có : 2x = 5y \(\Rightarrow\frac{x}{5}=\frac{y}{2}\Rightarrow\frac{x^2}{25}=\frac{y^2}{4}\)

Áp dụng t/c của dãy tỉ số bằng nhau, ta có :

\(\frac{x^2}{25}=\frac{y^2}{4}=\frac{x^2+y^2}{25+4}=\frac{133}{29}\)

Suy ra :

+) \(\frac{x^2}{25}=\frac{133}{29}\Leftrightarrow x^2=\frac{3325}{29}\Leftrightarrow x=\sqrt{\frac{3325}{29}}\approx10,7\)

+)\(\frac{y^2}{4}=\frac{133}{29}\Leftrightarrow y^2=\frac{532}{29}\Leftrightarrow y=\sqrt{\frac{532}{29}}\approx4,3\)

Vậy \(x\approx10,7;y\approx4,3\)

23 tháng 5 2017

When the Earth can't support all people in the world we say the world is overpopulated.

Overpopulation is one of the global issue and all the country in the world have to find out good solutions to it .

First of all , it causes the lack of food , drink , clothes , accommodation to people . Next , it causes the shortage of other services such as healthcare , education , job and so on . Those problem should be tackled as oon as possible .

Some solutions to the problem may be setting limit on the number of children in each family : one or two kids are reasonable . Moreover , people in the countryside work in their own homevillage to make it richer and richer instead of moving to the city to work and live

To sum up by doing these above things ,people will have better and better life .

23 tháng 5 2017

I live in Vietnam and there are a lot of traffic problems in big cities in my country. Firstly, there are too many people using the roads especially in the rush hour when people run out to work and school or get home from those places. Secondly, there are too many vehicles on the road that leads to traffic jams. Another problem is that many roads are narrow and bumpy. Fourthly, there are traffic accidents every day so a lot of people lose their lives or are injured. So in order to travel on the roads safely, I think we should obey the traffic rules and traffic signs as well. Moreover, carefulness is very necessary.

2 tháng 4 2018

Bạn hỏi toán sao lại đăng vào mục t.anh

6 tháng 8 2018

ưa mùa xuân xôn xao, phơi phới. Những hạt mưa bé nhỏ, mềm mại, rơi mà như nhảy nhót. Hạt nọ tiếp hạt kia đan xuống. Mùa đông xám xịt và khô héo đã qua. Mặt đất kiệt sức bỗng thức dậy, âu yếm đón lấy những hạt mưa ấm áptrong lành. Đất trời lại dịu mềm, lại cần mẫn tiếp nhựa chocây cỏ. Mưa xuân đã mang lại cho chúng cái sức sống ứ đầy, tràn lên các nhánh lá, mầm non. Và cây trả nghĩa cho mưa bằng cả mùa hoa thơm trái ngọt.

- Từ ghép: từ gạch chân
- Từ láy: in đậm