My hobby is reading knowledgeable and interesting books in my square time. Reading is such a good habit which healthy for your brain and keeps your brain functioning actively. Reading is a wonderful way to keeps you relax and happy. For me, there is nothing makes me happier than to have a stack of books on my nightstand to attack on a night when there is no alarm clock waiting the next morning. It’s the great source of enjoyment, inspiration , instruction, and knowledge. Reading book can make us disciplined, punctual, loyal and most importantly a very successful person in this life. While reading books, noone can feel disturb or alone. I think this hobby is more precious than other precious stones in the world. It can provide us noble thoughts, ideas to work in many fields and high level of knowledge. Interesting and knowledgeable book is like best friend of the someone who likes to read.

Đổi : 1 dm 3 cm = 13 cm 

Vì 13 cm > 9 cm nên đoạn AB < đoạn CD và đoạn CD lớn hơn đoạn AB số cm là : 

13 - 9 = 4 ( cm ) 

A=1-2002/2003

A=2003/2003-2002/2003

A=1/2003

Ta có \(\frac{x+y}{3}=\frac{5-z}{1}=\frac{y+z}{2}=\frac{9+y}{5}=k\left(1\right)\)

\(\frac{\left(x+y\right)+\left(5-z\right)+\left(y+z\right)+\left(9+y\right)}{3+1+2+5}=\frac{x+y-4}{1}\)

\(\Rightarrow\left\{\begin{matrix}x+y-4=k\\x+y=3k\end{matrix}\right.\)\(\Rightarrow k+4=x+y\)

\(\Rightarrow4+k=3k\Rightarrow4=2k\Rightarrow k=2\)

\(\Rightarrow5-z=k\Rightarrow z=5-k=5-2=3\)

\(9+y=5k\Rightarrow y=5k-9=10-9=1\)

\(x+y=3k\Rightarrow x=3k-y=6-1=5\)

Từ \(\left(1\right)\Rightarrow\left\{\begin{matrix}x=5\\y=1\\z=3\end{matrix}\right.\)

Theo tính chất của dãy tỉ số bằng nhau ta có từ (1)

\(\frac{y+z+1}{x}=\frac{y+z+1+x+z+2+x+y-3}{x+y+z}=\frac{2\left(x+y+z\right)}{x+y+z}\)

\(\Rightarrow\frac{1}{x+y+z}=2\Rightarrow x+y+z=0,5\)

\(\frac{y+z+1}{x}=2\Rightarrow y+z+1=2x\Rightarrow x+y+z+1=2x+x\)

\(\Rightarrow1,5=3x\Rightarrow x=\frac{1}{2}\)

Nếu \(a+y+z\ne0:\frac{x+z+2}{y}=2\Rightarrow x+y+z+2=3y\)

\(\Rightarrow2,5=3y\Rightarrow y=\frac{5}{6}\)

\(\frac{x+y-3}{z}=2\Rightarrow x+y+z-3=3z\)

\(\Rightarrow-\frac{5}{2}=3z\Rightarrow z=-\frac{5}{6}\)

Số bộ bàn ghế xưởng phải đóng là 30 x 12 = 360 (bộ)

Số ngày xưởng đó hoàn thành kế hoạch là 360 : 18 = 20 (ngày)

III. Use the words or phrases to make meaningful sentences.

1. Which/be/biggest/city/Viet Nam/ ?

-> Which is the biggest city in Viet Nam ?

2.Minh/ friends/be/going to/ have/picnic/near/lake

-> Minh and his friends are going to have a picnic near a lake

3. I'd like/sandwich/glass/milk/please

-> I'd like a sandwich and a glass of milk , please

4. Minh/leave/house/half past six.

-> Minh leaves the house at half past six

5. Ho Chi Minh City/have/population/3.5 million

-> Ho Chi Minh has a population ò 3.5 million