1/. English is an …………ingteresting……… and important subject INTEREST.

2/. In electronics they learn to repair ………household……appliances. HOUSE

3/. The most popular ……activity…….. at recess is talking . ACT

4/. Hoa is having a..........medical..........check-up MEDICINE

5/. In the countryside, people often know all the people in their.........neighborhood....... NEIGHBOR

6/. You must be careful when playing video games because they can be …addicted……. ADDICT

7/. I’d like a nice........??..........orange JUICE

8/. Edison’s most famous ……invention…. was the electronic bulb. INVENT

9/. This dictionary is very .......useful.......for you to learn English USE

10/. I have ........less............time to play than my friends LITTLE

Điều kiện \(x\ge\dfrac{3}{2}\). Khi đó pt đã cho tương đương với:

\(\dfrac{\left(\sqrt{2x-3}-\sqrt{x}\right)\left(\sqrt{2x-3}+\sqrt{x}\right)}{\sqrt{2x-3}+\sqrt{x}}=2\left(x-3\right)\)

\(\Leftrightarrow\dfrac{x-3}{\sqrt{2x-3}+\sqrt{x}}=2\left(x-3\right)\)

\(\Leftrightarrow\) hoặc x = 3 ( thỏa mãn ) hoặc \(2-\dfrac{1}{\sqrt{2x-3}+\sqrt{x}}=0\left(1\right)\)

Từ ĐK \(x\ge\dfrac{3}{2}>1\Rightarrow2-\dfrac{1}{\sqrt{2x-3}+\sqrt{x}}>0\)

Do đó PT ( 1 ) vô nghiệm.

Vậy PT đã cho có nghiệm duy nhất x = 3.

Thiệt ta là tui chép sách

Hình như thiếu mũ 2007 -.- Sửa luôn nhóe :)

Trước hết ta tính tổng sau, với các số tự nhiên a, n đều lớn hơn 1.

\(S_n=\dfrac{1}{a}+\dfrac{1}{a^2}+...+\dfrac{1}{a^n}\)

Ta có: \(\left(a-1\right)S_n=aS_n-S_n\)

\(=\left(1+\dfrac{1}{a}+\dfrac{1}{a^2}+...+\dfrac{1}{a^{n-1}}\right)-\left(\dfrac{1}{a}+\dfrac{1}{a^2}+...+\dfrac{1}{a^{n-1}}+\dfrac{1}{a^n}\right)\)\(=1-\dfrac{1}{a^n}< 1\Rightarrow S_n< \dfrac{1}{a-1}\left(1\right)\)

Áp dụng BĐT ( 1 ) cho a = 2008 và mọi n = 2,3, ..., 2004 ta được:

\(B=\dfrac{1}{2008}+\left(\dfrac{1}{2008}+\dfrac{1}{2008^2}\right)^2+...+\left(\dfrac{1}{2008}+\dfrac{1}{2008^2}+...+\dfrac{1}{2008^{2007}}\right)^{2007}< \dfrac{1}{2007}+\left(\dfrac{1}{2007}\right)^2+...+\left(\dfrac{1}{2007}\right)^{2007}\left(2\right)\)

Lại áp dụng BĐT ( 1 ) cho a = 2007 và n = 2007, ta được:

\(\dfrac{1}{2007}+\dfrac{1}{2007^2}+...+\dfrac{1}{2007^{2007}}< \dfrac{1}{2006}=A\left(3\right)\)

Từ ( 2 ) và ( 3 ) => B < A.

Chia dạng đúng của từ trong ngoặc

1: Hoa is very ..creative... ( create) and she paints very well

2: Nick s' hobby is collecting glass bottles , he s' a glass bottle ...collection...( collect)

3: you can use carved eggshell as ..decoration... ( decorate) in you house

4: I like reading books because it ....widen....( wide) my knowledge

5: reading books can also develop our....imagination...( imagine)

Cau 70: I’m thirsty. …….. is she.

A So B Too C Either D Neither

Cau 71: Choose the word that has the underlined part pronounced differently from the others.

A stomach B touch C teach D check ( vấn đề cmnr :D )

Cau 72: students / Khanh is / any other / taller than / in his class.

=> Khanh is taller than any other students in his class.

Cau 73: Vietnamese English / dictionary? / Whose / is / that

=> Whose is that Vietnamese English dictionary?

Cau 74: is always scared / the dentist. / when she / comes to see / My little daughter

=> My littler daughter is always scared when she comes to see the dentist.

Cau 75: on / a supermarket / Is / Tran Nhan Tong street? / there

=> Is there a supermarket on Tran Nhan Tong street?

Cau 76: have / Physical Education / Tuesday and Thursday. / Helen and Lenka / on

=> Helen and Lenka have Physical Education on Tuesday and Thursday.

Cau 77:…What…an expensive painting!

Cau 78: Would you like to go out with me tonight? – Sure. …What….time?

Cau 79: Do you have any writing………paper…….? ( giấy viết thư)

Cau 80: The energetic students often play soccer or ……basketball….. ( bóng rổ )

Cau 81: Choose the word that has the underlined part pronounced differently from the others.

A mouth B round C shoulder D noun

Cau 82: Choose the word that has the underlined part pronounced differently from the others.

A drawing B camp C ant D rack

Cau 83: Lan has a toothache. She should see a………….

A dentist B doctor C nurse D worker