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1,The history of these places interests me
I am interested in reading The history of these places
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 \(x\approx10,7;y\approx4,3\)
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 .
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.
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
bn ơi văn của bn ạ!!! bn có thể cko minkbt từ ghép đâu ko???
bài này là quy tắc dấu ngoặc nhưng mik lười đánh à
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