1) Trung và Nam Mĩ gồm những phần đất là: Eo đất Trung Mĩ, lục địa Nam Mĩ và các đảo, quần đảo trong biển Ca-ri-bê.

2) Các biển và đại dương bao quanh Trung và Nam Mĩ là:Đại Tây Dương, Thái Bình Dương và biển Ca-ri-bê.

Câu đầu là "it was a bright and sunny day" nhé.

It wasbright and sunny day. Little did i expect it to be an bad  one for me.

     I went to school early because I was on class duty. I stepped into the classroom and was surprised to find it spick and span. I was pleased that I didn't have to clean the classroom and went to off cheerfully for the flag-raising ceremony. When I returned to my classroom later on, my teacher scolded me for not cleaning the classroom. It was then that I realized i had gone to the wrong classroom ealier on. My teacher put me on duty again the next day as punishment.

    Just then, the school dental nurse walked into the classroom. To my dismay, I was called up for a dental check-up.

     The dentist found a badly decayed tooth and pulled it out mercilessly. I was close to tears. The dentist advised me to take porridge during recess. However, Iended up scalding mu tongue because i ate a hot porridge in a hurry.

     After school, I ride my bike home and fell, so i reached home later than unusual. When I got home, in the kitchen, i found a notefrom my mother saying that she had brought my brother toa funfair. They had left without me after i have a lot of pain.

     What a bad day! I will never remember about it!

Cho x>0, y>0 và x²>y²

Giả sử x<y thì theo câu a ta có x²<y², trái với giả thiết 

Giả sử x=y thì x²=y², trái với giả thiết 

 Vậy x>y

Cho x>y>0.

Nhân hai vế của x>y với số dương x ta được x²>xy (1)

Nhân 2 vế của x>y với số dương y ta được xy>y² (2)

 Từ (1) và (2) =>x²>y²

As a secondary student, I had to study many subjects but my friends used to advise me to concentrate more and more on Science and Maths. But somehow or other, English has become my favourite subject. My friends, relatives and even my parents were advising me that there is nothing new to learn in the English Language and I was wastng my time on English. Whatever the advice may be - English still my favourite subjects. 

     Reading as a hobby itself is a great pleasure. English has a wealth of literature unsurpassed by any other language. Study it enables me to enjoy the language. Studying more about Shakespeare. Shawn, Keat and Hard gives me an insight into huấn nature. I have come to realise how a man world react to a given set of circumstates or actions. The more I real, the more I learn in between the lines. 

   My love for the subject has inspired me so much that I may one day White my own play. As a scholar rightly pointed out that reading enobles man, make one more tolerant to the follies of others and bridges the gap between countries and cultures, I hope that it will do so for me too.

Trên tầng cao của khí quyển, hiện tượng nước ngưng tụ xảy ra nhiều hơn hiện tượng nước  bốc hơi. Mây và các giọt nước li ti trong mây dần dần tụ lại, hình thành những đám mây lớn hơn, nước rơi trở lại mặt đất dưới dạng nước, tạo thành mưa.

Ta có:\(\dfrac{14-x}{4-x}=\dfrac{10+4-x}{4-x}=\dfrac{10+\left(4-x\right)}{4-x}=1+\dfrac{10}{4-x}\)

Vì x∈Z,4∈Z=> 4-x∈Z

Để P đạt giá trị nhỏ nhất thì \(\dfrac{10}{4-x}\)phải đạt giá trị nhỏ nhất

=>4-x đạt giá trị lớn nhất

Và 4-x<0;4-x∈Z

Do đó 4-x=-1

     =>x=4+1=5

Khi đó P=\(\dfrac{14-5}{4-5}\)=-9

Vậy P đạt giá trị nhỏ nhất bằng -9 khi x=5