\(=\dfrac{1-a\sqrt{a}+\sqrt{a}\left(1-\sqrt{a}\right)}{1-\sqrt{a}}.\dfrac{1+a\sqrt{a}-\sqrt{a}\left(1+\sqrt{a}\right)}{1+\sqrt{a}}\)
\(=\dfrac{-a\sqrt{a}-a+\sqrt{a}+1}{1-\sqrt{a}}.\dfrac{a\sqrt{a}-a-\sqrt{a}+1}{1+\sqrt{a}}\)
\(=\dfrac{-a\left(\sqrt{a}+1\right)+\sqrt{a}+1}{1-\sqrt{a}}.\dfrac{a\left(\sqrt{a}-1\right)-\left(\sqrt{a}-1\right)}{1+\sqrt{a}}\)
\(=\dfrac{\left(1-a\right)\left(\sqrt{a}+1\right)}{1-\sqrt{a}}.\dfrac{\left(a-1\right)\left(\sqrt{a}-1\right)}{1+\sqrt{a}}\)
\(=\left(1-a\right).\left(1-a\right)\)
=(1-a)²

a

câu 1
"Làng" của Kim Lân
câu 2 
tâm trạng của ông hai sau khi nghe tin làng chợ dầu theo giặc
câu 3
Chúng bay ăn miếng cơm hay miếng gì vào mồm mà đi làm cái giống Việt gian bán nước để nhục nhã thế này.
 

1. There are modern knitting machines although he artisans in my village like using traditional looms.
2. Many children like to go to Bat Trang Ceramic village ashey can make their own pottery there. 
3. We have to follow more than ten stages so that we can make a simple conical hat. 
4. Sinh paintings are special since they are burned after worship. 
5. We’ll have to phone you first before we’ll organize the trip.
6. While we were visiting an old building. They were going to a traditional market. 

thay m=2 vào HPT ta có
\(\left\{{}\begin{matrix}x+2y=2+1\\2x+y=2.2\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x+2y=3\\2x+y=4\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}2x+4y=6\\2x+y=4\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}3y=2\\2x+y=4\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{5}{3}\\y=\dfrac{2}{3}\end{matrix}\right.\)
vậy ..........
 

1d
2d
3a
4b
5d
7c
8c
9d
10c
11b
12d
 

1. This girl has just made these pancakes.
=> these pancakes have just been made by this girl
2. My brother stopped playing online games 4 years ago
=> My brother has stopped playing online games for 4 years
=> My brother has not played  online games for 4 years
 

Complete the second sentence in each pair so that it has similar meaning to the first sentence.
33. “My father is a doctor here”, my friend said.

---> My friend said his/her father is a doctor there

34. I am not as interested in football as you are.

---> You are more interested in football than me

35. They have just sent an ambulance to the school.

---> An ambulance has just been sent to the school

36. My sister began to learn English when she was six years old.

---> My sister has learnt English when she was six years old.z

- coi đoàn kết dân tộc là động lực để phát triển đất nước
- khai thác tài nguyên thiên nhiên hợp lí
 

if you don't talk ,you won't wake the baby up
3, if you don't get up early, we will go without you
4, if you don't hurry up , youwill be late for class
5,if you drink some water, you will feel better
6, if yo don't drive more carefully , you will crash
7, if you don't smoke , you will be healthier