Refer 

I love sudying English so I want to visit Australia - an English speaking country.

Australia is a country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands. It is the world's sixth-largest country by total area. Although Australia has no official language, English has always been entrenched as the national language.

1.what do you think about the environment in your town?
In my hometown , people are not aware of environmental protection, there are still many people who are unaware and throw their garbage out, besides, there are still people who pick up trash and throw it in the right place.

Every day on the news reports, the news is everywhere, saying phrases like melting ice, global warming, acid rain, global climate change or adding new lands to become industrial landfills. All are consequences of environmental pollution.

My environment is small but very clean

tham khảo 

Australia is the smallest of the six continents and the only one having ‘one country’ in it. It remained cut off from the rest of the world after its geologic separation from Gondwanaland and its great distance from Europe, Americas and Asia. As a result very strange flora and fauna developed on this continent. It mostly consists of a flat, featureless land with no great rivers and no permanent snow covered mountains. The central lowlands are known for their underground water in their artesian basins. The Great Barrier Reef made up of coral rocks is a great tourist attraction.
Seasons in Australia are reverse of India because of the former’s location in Southern Hemisphere. It is mostly hot and dry as only 4% of the land is under cultivation. Wheat is grown extensively on the temperate grasslands in the Murray-Darling basin. Eucalyptus is the most common tree; nearly 700 varieties are found. The people have managed their limited land and water resources well.
Although the average density of the population is very low, most people live in the large cities and ports of the rainy eastern and south-eastern regions. Although the population is not much, Australia produces enough agricultural and industrial goods to meet its needs and still has plenty for export to other countries of the world.

TK: Australia is the smallest of the six continents and the only one having ‘one country’ in it. It remained cut off from the rest of the world after its geologic separation from Gondwanaland and its great distance from Europe, Americas and Asia. As a result very strange flora and fauna developed on this continent. It mostly consists of a flat, featureless land with no great rivers and no permanent snow covered mountains. The central lowlands are known for their underground water in their artesian basins. The Great Barrier Reef made up of coral rocks is a great tourist attraction.

Seasons in Australia are reverse of India because of the former’s location in Southern Hemisphere. It is mostly hot and dry as only 4% of the land is under cultivation. Wheat is grown extensively on the temperate grasslands in the Murray-Darling basin. Eucalyptus is the most common tree; nearly 700 varieties are found. The people have managed their limited land and water resources well.
Although the average density of the population is very low, most people live in the large cities and ports of the rainy eastern and south-eastern regions. Although the population is not much, Australia produces enough agricultural and industrial goods to meet its needs and still has plenty for export to other countries of the world.

Bài 2: 

a: Xét ΔABC có

X là trung điểm của BC

Y là trung điểm của AB

Do đó: XY là đường trung bình

=>XY//AC và XY=AC/2=3,5(cm)

hay XZ//AC và XZ=AC

b: Xét tứ giác AZBX có 

Y là trung điểm của AB

Y là trung điểm của ZX

Do đó: AZBX là hình bình hành

mà \(\widehat{AXB}=90^0\)

nên AZBX là hình chữ nhật

d: Xét tứ giác AZXC có

XZ//AC

XZ=AC

Do đó: AZXC là hình bình hành

tr oi có 4 câu em ko cần tách đou cj lm r đó

4*cos(pi/6-a)*sin(pi/3-a)

=4*(cospi/6*cosa+sinpi/6*sina)*(sinpi/3*cosa-sina*cospi/3)

=4*(căn 3/2*cosa+1/2*sina)*(căn 3/2*cosa-1/2*sina)

=4*(3/4*cos^2a-1/4*sin^2a)

=3cos^2a-sin^2a

=3(1-sin^2a)-sin^2a

=3-4sin^2a

=>m=3; n=-4

m^2-n^2=-7

Ta có:

\(\dfrac{1}{cos^2x-sin^2x}+\dfrac{2tanx}{1-tan^2x}=\dfrac{1}{cos2x}+tan2x=\dfrac{1}{cos2x}+\dfrac{sin2x}{cos2x}=\dfrac{1+sin2x}{cos2x}=\dfrac{cos2x}{1-sin2x}\)

\(\Rightarrow P=a+b=2+1=3\)